diff --git a/app/controllers/accounts_controller.rb b/app/controllers/accounts_controller.rb
index aba1428..b425ccc 100644
--- a/app/controllers/accounts_controller.rb
+++ b/app/controllers/accounts_controller.rb
@@ -3,7 +3,7 @@
 class AccountsController < ApplicationController
   before_action :set_account
 
-  # GET /accounts/:username
+  # GET /accounts/:nickname
   def show
     authorize @account
   end
@@ -11,6 +11,6 @@ class AccountsController < ApplicationController
 private
 
   def set_account
-    @account = Account.find_by! username: params[:username]
+    @account = Account.find_by! nickname: params[:nickname]
   end
 end
diff --git a/app/models/account.rb b/app/models/account.rb
index 24c9235..ca74f30 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -4,7 +4,7 @@ class Account < ApplicationRecord
   include Rolify::Role
   extend Rolify::Dynamic if Rolify.dynamic_shortcuts
 
-  USERNAME_RE = /\A[a-z][_a-z0-9]*[a-z0-9]\z/.freeze
+  NICKNAME_RE = /\A[a-z][_a-z0-9]*[a-z0-9]\z/.freeze
 
   self.role_cname = 'Role'
   self.role_table_name = 'roles'
@@ -45,7 +45,7 @@ class Account < ApplicationRecord
   # Callbacks #
   #############
 
-  after_initialize :generate_username
+  after_initialize :generate_nickname
 
   before_validation :turn_blanks_into_nils
   before_validation :strip_extra_spaces
@@ -58,10 +58,10 @@ class Account < ApplicationRecord
 
   validates :person, allow_nil: true, uniqueness: true
 
-  validates :username,
+  validates :nickname,
             presence:   true,
             length:     { in: 3..36 },
-            format:     USERNAME_RE,
+            format:     NICKNAME_RE,
             uniqueness: { case_sensitive: false }
 
   validates :public_name, allow_nil: true, length: { in: 3..255 }
@@ -73,7 +73,7 @@ class Account < ApplicationRecord
   ###########
 
   def to_param
-    username
+    nickname
   end
 
   def guest?
@@ -109,8 +109,8 @@ class Account < ApplicationRecord
 
 private
 
-  def generate_username
-    self.username = "noname_#{SecureRandom.hex(8)}" if username.nil?
+  def generate_nickname
+    self.nickname = "noname_#{SecureRandom.hex(8)}" if nickname.nil?
   end
 
   def generate_guest_token
diff --git a/app/policies/settings/profile_policy.rb b/app/policies/settings/profile_policy.rb
index 5e159c0..67b797f 100644
--- a/app/policies/settings/profile_policy.rb
+++ b/app/policies/settings/profile_policy.rb
@@ -6,6 +6,6 @@ class Settings::ProfilePolicy < ApplicationPolicy
   end
 
   def permitted_attributes_for_update
-    %i[username public_name biography avatar]
+    %i[nickname public_name biography avatar]
   end
 end
diff --git a/app/views/accounts/show.html.erb b/app/views/accounts/show.html.erb
index 99cc8bf..ce6c6dc 100644
--- a/app/views/accounts/show.html.erb
+++ b/app/views/accounts/show.html.erb
@@ -9,7 +9,7 @@
         <h1><%= @account.public_name %></h1>
       <% end %>
 
-      <p class="h3 text-muted"><%= @account.username %></p>
+      <p class="h3 text-muted"><%= @account.nickname %></p>
 
       <div class="mb-2">
         <i class="fas fa-user-tag"></i>
diff --git a/app/views/application/_navbar.html.erb b/app/views/application/_navbar.html.erb
index 9507967..e780280 100644
--- a/app/views/application/_navbar.html.erb
+++ b/app/views/application/_navbar.html.erb
@@ -17,7 +17,7 @@
       <ul class="navbar-nav ml-auto mr-3">
         <% if current_account %>
           <li class="nav-item dropdown">
-            <%= link_to current_account.username,
+            <%= link_to current_account.nickname,
                         '#',
                         id: :navbarDropdown,
                         role: :button,
diff --git a/app/views/settings/profiles/edit.html.erb b/app/views/settings/profiles/edit.html.erb
index cd3a682..05ffe10 100644
--- a/app/views/settings/profiles/edit.html.erb
+++ b/app/views/settings/profiles/edit.html.erb
@@ -9,7 +9,7 @@
         <%= f.error_notification %>
 
         <div class="form-inputs">
-          <%= f.input :username, required: true %>
+          <%= f.input :nickname, required: true %>
           <%= f.input :public_name %>
           <%= f.input :biography %>
           <%= f.input :avatar, direct_upload: true %>
diff --git a/config/routes.rb b/config/routes.rb
index 3160a67..2b19a14 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -13,7 +13,7 @@ Rails.application.routes.draw do
   get  :join,        to: 'membership_apps#new'
   post :join,        to: 'membership_apps#create'
 
-  resources :accounts, param: :username, only: :show
+  resources :accounts, param: :nickname, only: :show
 
   resources :country_states, only: %i[index show]
 
diff --git a/config/settings/superuser.yml b/config/settings/superuser.yml
index 9b5fd6a..b673acc 100644
--- a/config/settings/superuser.yml
+++ b/config/settings/superuser.yml
@@ -1,13 +1,13 @@
 development:
   email:       admin@example.com
   password:    password
-  username:    admin
+  nickname:    admin
   public_name: Just Admin
   biography:   I am creator of the website you read this text on.
 
 production:
   email:       <%= Rails.application.credentials.superuser_email %>
   password:    <%= Rails.application.credentials.superuser_password %>
-  username:    kotovalexarian
+  nickname:    kotovalexarian
   public_name: Alex Kotov
   biography:   I am creator of the website you read this text on.
diff --git a/db/migrate/20190324192022_rename_accounts_username_to_nickname.rb b/db/migrate/20190324192022_rename_accounts_username_to_nickname.rb
new file mode 100644
index 0000000..a7bde27
--- /dev/null
+++ b/db/migrate/20190324192022_rename_accounts_username_to_nickname.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class RenameAccountsUsernameToNickname < ActiveRecord::Migration[6.0]
+  def change
+    rename_column :accounts, :username, :nickname
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 70b7750..a5a877f 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_03_24_172539) do
+ActiveRecord::Schema.define(version: 2019_03_24_192022) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -32,7 +32,7 @@ ActiveRecord::Schema.define(version: 2019_03_24_172539) do
     t.datetime "updated_at", null: false
     t.string "guest_token", null: false
     t.bigint "person_id"
-    t.string "username", null: false
+    t.string "nickname", null: false
     t.text "biography"
     t.string "public_name"
     t.index ["person_id"], name: "index_accounts_on_person_id", unique: true
diff --git a/db/seeds.rb b/db/seeds.rb
index ab7052e..686b349 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -15,7 +15,7 @@ Rails.application.settings(:superuser).tap do |config|
     new_user.password = config[:password]
     new_user.confirmed_at = Time.zone.now
     new_user.account = Account.create!(
-      username:    config[:username],
+      nickname:    config[:nickname],
       public_name: config[:public_name],
       biography:   config[:biography],
     )
diff --git a/features/desktop/account.feature b/features/desktop/account.feature
index f7c4e9b..94b1f31 100644
--- a/features/desktop/account.feature
+++ b/features/desktop/account.feature
@@ -1,7 +1,7 @@
 Feature: Account
   Scenario: of a user
     Given there is a usual account with the following data:
-      | username      | kotovalexarian |
+      | nickname      | kotovalexarian |
       | public_name   | Alex Kotov     |
       | biography     | Hi there :)    |
     When I visit "/accounts/kotovalexarian"
@@ -12,7 +12,7 @@ Feature: Account
 
   Scenario: of a supporter
     Given there is a supporter account with the following data:
-      | username      | kotovalexarian |
+      | nickname      | kotovalexarian |
       | public_name   | Alex Kotov     |
       | biography     | Hi there :)    |
       | country_state | Москва         |
@@ -25,7 +25,7 @@ Feature: Account
 
   Scenario: of a member
     Given there is a member account with the following data:
-      | username      | kotovalexarian |
+      | nickname      | kotovalexarian |
       | public_name   | Alex Kotov     |
       | biography     | Hi there :)    |
       | country_state | Москва         |
@@ -38,7 +38,7 @@ Feature: Account
 
   Scenario: of an excluded member
     Given there is an excluded member account with the following data:
-      | username      | kotovalexarian |
+      | nickname      | kotovalexarian |
       | public_name   | Alex Kotov     |
       | biography     | Hi there :)    |
       | country_state | Москва         |
diff --git a/features/step_definitions/account.rb b/features/step_definitions/account.rb
index 90edea6..f3b56b5 100644
--- a/features/step_definitions/account.rb
+++ b/features/step_definitions/account.rb
@@ -4,7 +4,7 @@ When 'there is a usual account with the following data:' do |table|
   options = table.raw.map { |(k, v)| [k.to_sym, v] }.to_h
 
   create :usual_account,
-         username:    options[:username],
+         nickname:    options[:nickname],
          public_name: options[:public_name],
          biography:   options[:biography]
 end
@@ -17,7 +17,7 @@ When 'there is a supporter account with the following data:' do |table|
   person = create :supporter_person, regional_office: regional_office
 
   create :personal_account,
-         username:    options[:username],
+         nickname:    options[:nickname],
          public_name: options[:public_name],
          biography:   options[:biography],
          person:      person
@@ -31,7 +31,7 @@ When 'there is a member account with the following data:' do |table|
   person = create :member_person, regional_office: regional_office
 
   create :personal_account,
-         username:    options[:username],
+         nickname:    options[:nickname],
          public_name: options[:public_name],
          biography:   options[:biography],
          person:      person
@@ -45,7 +45,7 @@ When 'there is an excluded member account with the following data:' do |table|
   person = create :excluded_person, regional_office: regional_office
 
   create :personal_account,
-         username:    options[:username],
+         nickname:    options[:nickname],
          public_name: options[:public_name],
          biography:   options[:biography],
          person:      person
diff --git a/features/step_definitions/user.rb b/features/step_definitions/user.rb
index 41f73d8..ab509fd 100644
--- a/features/step_definitions/user.rb
+++ b/features/step_definitions/user.rb
@@ -21,7 +21,7 @@ Given 'I am signed in as superuser' do
     click_on 'Войти'
   end
 
-  expect(page).to have_css 'ul > li > a', text: @account.user.account.username
+  expect(page).to have_css 'ul > li > a', text: @account.nickname
 end
 
 Given 'I am signed in with email {string}' do |email|
@@ -36,7 +36,7 @@ Given 'I am signed in with email {string}' do |email|
     click_on 'Войти'
   end
 
-  expect(page).to have_css 'ul > li > a', text: @account.username
+  expect(page).to have_css 'ul > li > a', text: @account.nickname
 end
 
 Given 'I am signed in with email {string} ' \
@@ -52,7 +52,7 @@ Given 'I am signed in with email {string} ' \
     click_on 'Войти'
   end
 
-  expect(page).to have_css 'ul > li > a', text: @account.username
+  expect(page).to have_css 'ul > li > a', text: @account.nickname
 end
 
 Given 'I am signed in as party supporter' do
@@ -69,7 +69,7 @@ Given 'I am signed in as party supporter' do
     click_on 'Войти'
   end
 
-  expect(page).to have_css 'ul > li > a', text: @account.username
+  expect(page).to have_css 'ul > li > a', text: @account.nickname
 end
 
 Given 'I am signed in as party member' do
@@ -86,7 +86,7 @@ Given 'I am signed in as party member' do
     click_on 'Войти'
   end
 
-  expect(page).to have_css 'ul > li > a', text: @account.username
+  expect(page).to have_css 'ul > li > a', text: @account.nickname
 end
 
 Given 'I am signed in as excluded party member' do
@@ -103,7 +103,7 @@ Given 'I am signed in as excluded party member' do
     click_on 'Войти'
   end
 
-  expect(page).to have_css 'ul > li > a', text: @account.username
+  expect(page).to have_css 'ul > li > a', text: @account.nickname
 end
 
 When 'I try to sign in with email {string} ' \
@@ -119,7 +119,7 @@ When 'I try to sign in with email {string} ' \
 end
 
 When 'I try to sign out' do
-  click_on @account.username
+  click_on @account.nickname
   click_on 'Выйти'
 end
 
@@ -130,7 +130,7 @@ end
 
 Then 'I am signed in as {string}' do |email|
   user = User.find_by! email: email
-  expect(page).to have_css 'ul > li > a', text: user.account.username
+  expect(page).to have_css 'ul > li > a', text: user.account.nickname
 end
 
 Then 'I fail to sign in' do
diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
index b87e5e4..4a339d6 100644
--- a/spec/models/account_spec.rb
+++ b/spec/models/account_spec.rb
@@ -48,22 +48,22 @@ RSpec.describe Account do
 
   describe '#to_param' do
     specify do
-      expect(subject.to_param).to eq subject.username
+      expect(subject.to_param).to eq subject.nickname
     end
   end
 
-  describe '#username' do
+  describe '#nickname' do
     def allow_value(*)
-      super.for :username
+      super.for :nickname
     end
 
-    it { is_expected.to validate_presence_of :username }
+    it { is_expected.to validate_presence_of :nickname }
 
     it do
-      is_expected.to validate_length_of(:username).is_at_least(3).is_at_most(36)
+      is_expected.to validate_length_of(:nickname).is_at_least(3).is_at_most(36)
     end
 
-    it { is_expected.to validate_uniqueness_of(:username).case_insensitive }
+    it { is_expected.to validate_uniqueness_of(:nickname).case_insensitive }
 
     it { is_expected.not_to allow_value nil }
     it { is_expected.not_to allow_value '' }
diff --git a/spec/requests/accounts/show_spec.rb b/spec/requests/accounts/show_spec.rb
index 53af333..433df11 100644
--- a/spec/requests/accounts/show_spec.rb
+++ b/spec/requests/accounts/show_spec.rb
@@ -2,12 +2,12 @@
 
 require 'rails_helper'
 
-RSpec.describe 'GET /accounts/:username' do
+RSpec.describe 'GET /accounts/:nickname' do
   let!(:account_record) { create :personal_account }
 
   before do
     sign_in current_account.user if current_account&.user
-    get "/accounts/#{account_record.username}"
+    get "/accounts/#{account_record.nickname}"
   end
 
   for_account_types nil, :guest, :usual, :superuser do
diff --git a/spec/requests/settings/profile/update_spec.rb b/spec/requests/settings/profile/update_spec.rb
index 374648a..1343ca9 100644
--- a/spec/requests/settings/profile/update_spec.rb
+++ b/spec/requests/settings/profile/update_spec.rb
@@ -7,7 +7,7 @@ RSpec.describe 'PATCH/PUT /settings/profile' do
 
   let :account_attributes do
     {
-      username:    Faker::Internet.username(3..36, %w[_]),
+      nickname:    Faker::Internet.username(3..36, %w[_]),
       public_name: Faker::Name.name,
       biography:   Faker::Lorem.paragraph,
     }
@@ -32,9 +32,9 @@ RSpec.describe 'PATCH/PUT /settings/profile' do
   for_account_types :usual, :superuser do
     specify do
       expect { make_request }.to \
-        change { current_account.reload.username }
-        .from(current_account.username)
-        .to(account_attributes[:username])
+        change { current_account.reload.nickname }
+        .from(current_account.nickname)
+        .to(account_attributes[:nickname])
     end
 
     specify do