diff --git a/pkg/commands/git_commands/github.go b/pkg/commands/git_commands/github.go
index 23d95f924..85893615d 100644
--- a/pkg/commands/git_commands/github.go
+++ b/pkg/commands/git_commands/github.go
@@ -283,7 +283,7 @@ func GenerateGithubPullRequestMap(
 	prByKey := map[prKey]models.GithubPullRequest{}
 
 	for _, pr := range prs {
-		key := prKey{owner: pr.UserName(), branchName: pr.BranchName()}
+		key := prKey{owner: strings.ToLower(pr.UserName()), branchName: pr.BranchName()}
 		// PRs are returned newest-first from the API, so the first one we
 		// see for each key is the most recent and therefore the most relevant.
 		if _, exists := prByKey[key]; !exists {
@@ -307,7 +307,7 @@ func GenerateGithubPullRequestMap(
 			owner = repoInfo.Owner
 		}
 
-		pr, hasPr := prByKey[prKey{owner: owner, branchName: branch.UpstreamBranch}]
+		pr, hasPr := prByKey[prKey{owner: strings.ToLower(owner), branchName: branch.UpstreamBranch}]
 
 		if !hasPr {
 			continue
@@ -348,7 +348,7 @@ func (self *GitHubCommands) InGithubRepo(remotes []*models.Remote) bool {
 	}
 
 	url := remote.Urls[0]
-	return strings.Contains(url, "github.com")
+	return strings.Contains(strings.ToLower(url), "github.com")
 }
 
 func getMainRemote(remotes []*models.Remote) *models.Remote {
diff --git a/pkg/commands/git_commands/github_test.go b/pkg/commands/git_commands/github_test.go
index 48d736386..d9d55ffd1 100644
--- a/pkg/commands/git_commands/github_test.go
+++ b/pkg/commands/git_commands/github_test.go
@@ -318,6 +318,40 @@ func TestGenerateGithubPullRequestMap(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "matches when owner casing differs",
+			prs: []*models.GithubPullRequest{
+				{
+					HeadRefName:         "fix-case-insensitive",
+					Number:              42,
+					Title:               "Fix case insensitive",
+					State:               "OPEN",
+					HeadRepositoryOwner: models.GithubRepositoryOwner{Login: "Jesseduffield"}, // Uppercase J
+				},
+			},
+			branches: []*models.Branch{
+				{
+					Name:           "fix-case-insensitive",
+					UpstreamRemote: "origin",
+					UpstreamBranch: "fix-case-insensitive",
+				},
+			},
+			remotes: []*models.Remote{
+				{
+					Name: "origin",
+					Urls: []string{"git@github.com:jesseduffield/lazygit.git"}, // Lowercase j
+				},
+			},
+			expected: map[string]*models.GithubPullRequest{
+				"fix-case-insensitive": {
+					HeadRefName:         "fix-case-insensitive",
+					Number:              42,
+					Title:               "Fix case insensitive",
+					State:               "OPEN",
+					HeadRepositoryOwner: models.GithubRepositoryOwner{Login: "Jesseduffield"},
+				},
+			},
+		},
 	}
 
 	for _, c := range cases {