diff --git a/options/locale/locale_en-US.ini b/options/locale/locale_en-US.ini
index 4d9d9bc60e66f..8463411f8753c 100644
--- a/options/locale/locale_en-US.ini
+++ b/options/locale/locale_en-US.ini
@@ -1654,6 +1654,10 @@ pulls.switch_comparison_type = Switch comparison type
 pulls.switch_head_and_base = Switch head and base
 pulls.filter_branch = Filter branch
 pulls.no_results = No results found.
+pulls.show_all_commits = Show all commits
+pulls.show_all_commits.description = Show all commits of this PR
+pulls.showing_only_single_commit = Showing only changes of commit %[1]s
+pulls.select_commits = Filter commit
 pulls.nothing_to_compare = These branches are equal. There is no need to create a pull request.
 pulls.nothing_to_compare_and_allow_empty_pr = These branches are equal. This PR will be empty.
 pulls.has_pull_request = `A pull request between these branches already exists: <a href="%[1]s">%[2]s#%[3]d</a>`
diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index f2a58a35a78a8..3bad07283085a 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -683,6 +683,8 @@ func ViewPullCommits(ctx *context.Context) {
 
 // ViewPullFiles render pull request changed files list page
 func ViewPullFiles(ctx *context.Context) {
+	commitToShow := ctx.Params("sha")
+
 	ctx.Data["PageIsPullList"] = true
 	ctx.Data["PageIsPullFiles"] = true
 
@@ -719,8 +721,16 @@ func ViewPullFiles(ctx *context.Context) {
 	}
 
 	startCommitID = prInfo.MergeBase
-	endCommitID = headCommitID
 
+	if len(commitToShow) > 0 {
+		endCommitID = commitToShow
+		ctx.Data["IsShowingAllCommits"] = false
+	} else {
+		endCommitID = headCommitID
+		ctx.Data["IsShowingAllCommits"] = true
+	}
+
+	ctx.Data["Commits"] = prInfo.Commits
 	ctx.Data["Username"] = ctx.Repo.Owner.Name
 	ctx.Data["Reponame"] = ctx.Repo.Repository.Name
 	ctx.Data["AfterCommitID"] = endCommitID
@@ -732,14 +742,30 @@ func ViewPullFiles(ctx *context.Context) {
 	if fileOnly && (len(files) == 2 || len(files) == 1) {
 		maxLines, maxFiles = -1, -1
 	}
-	diffOptions := &gitdiff.DiffOptions{
-		BeforeCommitID:     startCommitID,
-		AfterCommitID:      endCommitID,
-		SkipTo:             ctx.FormString("skip-to"),
-		MaxLines:           maxLines,
-		MaxLineCharacters:  setting.Git.MaxGitDiffLineCharacters,
-		MaxFiles:           maxFiles,
-		WhitespaceBehavior: gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)),
+
+	var diffOptions *gitdiff.DiffOptions
+
+	// show only a single commit for this pr
+	if len(commitToShow) > 0 {
+		diffOptions = &gitdiff.DiffOptions{
+			AfterCommitID:      endCommitID,
+			SkipTo:             ctx.FormString("skip-to"),
+			MaxLines:           maxLines,
+			MaxLineCharacters:  setting.Git.MaxGitDiffLineCharacters,
+			MaxFiles:           maxFiles,
+			WhitespaceBehavior: gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)),
+		}
+	} else {
+		// show full PR diff
+		diffOptions = &gitdiff.DiffOptions{
+			BeforeCommitID:     startCommitID,
+			AfterCommitID:      endCommitID,
+			SkipTo:             ctx.FormString("skip-to"),
+			MaxLines:           maxLines,
+			MaxLineCharacters:  setting.Git.MaxGitDiffLineCharacters,
+			MaxFiles:           maxFiles,
+			WhitespaceBehavior: gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)),
+		}
 	}
 
 	var methodWithError string
diff --git a/routers/web/web.go b/routers/web/web.go
index 26ad2d54c3a32..bc7164770c5f9 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -1286,6 +1286,7 @@ func registerRoutes(m *web.Route) {
 			m.Post("/cleanup", context.RepoMustNotBeArchived(), context.RepoRef(), repo.CleanUpPullRequest)
 			m.Group("/files", func() {
 				m.Get("", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFiles)
+				m.Get("/{sha}", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFiles)
 				m.Group("/reviews", func() {
 					m.Get("/new_comment", repo.RenderNewCodeCommentForm)
 					m.Post("/comments", web.Bind(forms.CodeCommentForm{}), repo.SetShowOutdatedComments, repo.CreateCodeComment)
diff --git a/templates/repo/diff/box.tmpl b/templates/repo/diff/box.tmpl
index 1198452f7e567..1c44628a3ef4a 100644
--- a/templates/repo/diff/box.tmpl
+++ b/templates/repo/diff/box.tmpl
@@ -43,11 +43,19 @@
 				{{end}}
 				{{template "repo/diff/whitespace_dropdown" .}}
 				{{template "repo/diff/options_dropdown" .}}
+				{{if .PageIsPullFiles}}
+					{{template "repo/diff/commits_dropdown" .}}
+				{{end}}
 				{{if and .PageIsPullFiles $.SignedUserID (not .IsArchived)}}
 					{{template "repo/diff/new_review" .}}
 				{{end}}
 			</div>
 		</div>
+		{{if and (not .IsShowingAllCommits) .PageIsPullFiles}}
+			<div class="ui info message">
+				<div class="text gt-whitespace-pre">{{.locale.Tr "repo.pulls.showing_only_single_commit" (ShortSha .AfterCommitID)}}</div>
+			</div>
+		{{end}}
 		<script id="diff-data-script" type="module">
 			const diffDataFiles = [{{range $i, $file := .Diff.Files}}{Name:"{{$file.Name}}",NameHash:"{{$file.NameHash}}",Type:{{$file.Type}},IsBin:{{$file.IsBin}},Addition:{{$file.Addition}},Deletion:{{$file.Deletion}},IsViewed:{{$file.IsViewed}}},{{end}}];
 			const diffData = {
diff --git a/templates/repo/diff/commits_dropdown.tmpl b/templates/repo/diff/commits_dropdown.tmpl
new file mode 100644
index 0000000000000..31e3aa62da60a
--- /dev/null
+++ b/templates/repo/diff/commits_dropdown.tmpl
@@ -0,0 +1,32 @@
+<div class="ui dropdown tiny basic button" data-tooltip-content="{{.locale.Tr "repo.pulls.select_commits"}}">
+	{{svg "octicon-git-commit"}}
+	<div class="menu">
+		<a class="vertical item" href="{{$.Issue.Link}}/files?style={{if $.IsSplitStyle}}split{{else}}unified{{end}}&whitespace={{$.WhitespaceBehavior}}&show-outdated={{$.ShowOutdatedComments}}">
+			<span class="description">
+				{{.locale.Tr "repo.pulls.show_all_commits.description"}}
+			</span>
+			<span class="text">
+				<input class="gt-mr-3 gt-pointer-events-none" type="radio"{{if .IsShowingAllCommits}} checked{{end}}>
+				{{.locale.Tr "repo.pulls.show_all_commits"}}
+			</span>
+		</a>
+		{{range .Commits}}
+			<a class="vertical item" href="{{$.Issue.Link}}/files/{{.ID.String}}?style={{if $.IsSplitStyle}}split{{else}}unified{{end}}&whitespace={{$.WhitespaceBehavior}}&show-outdated={{$.ShowOutdatedComments}}">
+				<span class="description">
+					{{if .Committer}}
+						{{.Committer.Name}}
+						<td class="text right aligned">{{TimeSince .Committer.When $.locale}}</td>
+					{{else}}
+						{{.Author.Name}}
+						<td class="text right aligned">{{TimeSince .Author.When $.locale}}</td>
+					{{end}}
+				</span>
+				<div class="text">
+					<input class="gt-mr-3 gt-pointer-events-none" type="radio"{{if and (eq .ID.String $.AfterCommitID) (not $.IsShowingAllCommits)}} checked{{end}}>
+					<span class="ui compact">{{.Summary}}</span>
+					<span class="ui compact right shortsha">{{ShortSha .ID.String}}</span>
+				</div>
+			</a>
+		{{end}}
+	</div>
+</div>