diff --git a/changelogs/unreleased/add-allow_failure-to-job-api.yml b/changelogs/unreleased/add-allow_failure-to-job-api.yml
new file mode 100644
index 00000000000..5dd2b9708c5
--- /dev/null
+++ b/changelogs/unreleased/add-allow_failure-to-job-api.yml
@@ -0,0 +1,5 @@
+---
+title: Add allow_failure attribute to Job API
+merge_request: 28406
+author:
+type: added
diff --git a/doc/api/jobs.md b/doc/api/jobs.md
index 877cd99723a..d51451b9c83 100644
--- a/doc/api/jobs.md
+++ b/doc/api/jobs.md
@@ -32,6 +32,7 @@ Example of response
       "title": "Test the CI integration."
     },
     "coverage": null,
+    "allow_failure": false,
     "created_at": "2015-12-24T15:51:21.727Z",
     "started_at": "2015-12-24T17:54:24.729Z",
     "finished_at": "2015-12-24T17:54:24.921Z",
@@ -81,6 +82,7 @@ Example of response
       "title": "Test the CI integration."
     },
     "coverage": null,
+    "allow_failure": false,
     "created_at": "2015-12-24T15:51:21.802Z",
     "started_at": "2015-12-24T17:54:27.722Z",
     "finished_at": "2015-12-24T17:54:27.895Z",
@@ -165,6 +167,7 @@ Example of response
       "title": "Test the CI integration."
     },
     "coverage": null,
+    "allow_failure": false,
     "created_at": "2015-12-24T15:51:21.727Z",
     "started_at": "2015-12-24T17:54:24.729Z",
     "finished_at": "2015-12-24T17:54:24.921Z",
@@ -214,6 +217,7 @@ Example of response
       "title": "Test the CI integration."
     },
     "coverage": null,
+    "allow_failure": false,
     "created_at": "2015-12-24T15:51:21.802Z",
     "started_at": "2015-12-24T17:54:27.722Z",
     "finished_at": "2015-12-24T17:54:27.895Z",
@@ -296,6 +300,7 @@ Example of response
     "title": "Test the CI integration."
   },
   "coverage": null,
+  "allow_failure": false,
   "created_at": "2015-12-24T15:51:21.880Z",
   "started_at": "2015-12-24T17:54:30.733Z",
   "finished_at": "2015-12-24T17:54:31.198Z",
@@ -528,6 +533,7 @@ Example of response
     "title": "Test the CI integration."
   },
   "coverage": null,
+  "allow_failure": false,
   "created_at": "2016-01-11T10:13:33.506Z",
   "started_at": "2016-01-11T10:14:09.526Z",
   "finished_at": null,
@@ -576,6 +582,7 @@ Example of response
     "title": "Test the CI integration."
   },
   "coverage": null,
+  "allow_failure": false,
   "created_at": "2016-01-11T10:13:33.506Z",
   "started_at": null,
   "finished_at": null,
@@ -628,6 +635,7 @@ Example of response
     "title": "Test the CI integration."
   },
   "coverage": null,
+  "allow_failure": false,
   "download_url": null,
   "id": 42,
   "name": "rubocop",
@@ -681,6 +689,7 @@ Example response:
     "title": "Test the CI integration."
   },
   "coverage": null,
+  "allow_failure": false,
   "download_url": null,
   "id": 42,
   "name": "rubocop",
@@ -757,6 +766,7 @@ Example of response
     "title": "Test the CI integration."
   },
   "coverage": null,
+  "allow_failure": false,
   "created_at": "2016-01-11T10:13:33.506Z",
   "started_at": null,
   "finished_at": null,
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index 625fada4f08..1a3318fe849 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -1266,7 +1266,7 @@ module API
     end
 
     class JobBasic < Grape::Entity
-      expose :id, :status, :stage, :name, :ref, :tag, :coverage
+      expose :id, :status, :stage, :name, :ref, :tag, :coverage, :allow_failure
       expose :created_at, :started_at, :finished_at
       expose :duration
       expose :user, with: User
diff --git a/spec/fixtures/api/schemas/public_api/v4/job.json b/spec/fixtures/api/schemas/public_api/v4/job.json
index 454935422a0..c038ae0a664 100644
--- a/spec/fixtures/api/schemas/public_api/v4/job.json
+++ b/spec/fixtures/api/schemas/public_api/v4/job.json
@@ -28,6 +28,7 @@
     "ref": { "type": "string" },
     "tag": { "type": "boolean" },
     "coverage": { "type": ["number", "null"] },
+    "allow_failure": { "type": "boolean" },
     "created_at": { "type": "string" },
     "started_at": { "type": ["null", "string"] },
     "finished_at": { "type": ["null", "string"] },
diff --git a/spec/requests/api/jobs_spec.rb b/spec/requests/api/jobs_spec.rb
index c14507de186..43462913497 100644
--- a/spec/requests/api/jobs_spec.rb
+++ b/spec/requests/api/jobs_spec.rb
@@ -286,6 +286,7 @@ describe API::Jobs do
         expect(json_response['ref']).to eq(job.ref)
         expect(json_response['tag']).to eq(job.tag)
         expect(json_response['coverage']).to eq(job.coverage)
+        expect(json_response['allow_failure']).to eq(job.allow_failure)
         expect(Time.parse(json_response['created_at'])).to be_like_time(job.created_at)
         expect(Time.parse(json_response['started_at'])).to be_like_time(job.started_at)
         expect(Time.parse(json_response['finished_at'])).to be_like_time(job.finished_at)