diff --git a/internal/store/orgs.go b/internal/store/orgs.go
index 007a9e1..0e64cf3 100644
--- a/internal/store/orgs.go
+++ b/internal/store/orgs.go
@@ -377,7 +377,7 @@ func (s *Store) ListOrgMembers(ctx context.Context, orgID int64) ([]OrgMemberInf
 		SELECT u.id, u.username, u.display_name, m.role
 		FROM org_members m JOIN users u ON u.id = m.user_id
 		WHERE m.org_id = $1
-		ORDER BY (m.role = 'admin') DESC, u.username`, orgID)
+		ORDER BY (m.role = 'admin') DESC, COALESCE(NULLIF(u.display_name, ''), u.username)`, orgID)
 	if err != nil {
 		return nil, fmt.Errorf("list members: %w", err)
 	}
diff --git a/internal/store/shares.go b/internal/store/shares.go
index a45882e..1422e94 100644
--- a/internal/store/shares.go
+++ b/internal/store/shares.go
@@ -114,7 +114,7 @@ func (s *Store) ListShares(ctx context.Context, repeaterID int64) ([]ShareInfo,
 		SELECT u.id, u.username, u.display_name, rs.steward
 		FROM repeater_shares rs JOIN users u ON u.id = rs.user_id
 		WHERE rs.repeater_id = $1
-		ORDER BY u.username`, repeaterID)
+		ORDER BY COALESCE(NULLIF(u.display_name, ''), u.username)`, repeaterID)
 	if err != nil {
 		return nil, fmt.Errorf("list shares: %w", err)
 	}
@@ -157,7 +157,7 @@ func (s *Store) ListStewards(ctx context.Context, repeaterID int64) ([]ShareInfo
 		SELECT u.id, u.username, u.display_name, rs.steward
 		FROM repeater_shares rs JOIN users u ON u.id = rs.user_id
 		WHERE rs.repeater_id = $1 AND rs.steward
-		ORDER BY u.username`, repeaterID)
+		ORDER BY COALESCE(NULLIF(u.display_name, ''), u.username)`, repeaterID)
 	if err != nil {
 		return nil, fmt.Errorf("list stewards: %w", err)
 	}
diff --git a/internal/store/user_ordering_test.go b/internal/store/user_ordering_test.go
new file mode 100644
index 0000000..27ba278
--- /dev/null
+++ b/internal/store/user_ordering_test.go
@@ -0,0 +1,99 @@
+package store
+
+import (
+	"strings"
+	"testing"
+)
+
+// TestUserListsOrderByDisplayName: org member and repeater share lists must be
+// ordered by the name actually shown (display name, falling back to username),
+// not by username — so the on-screen order matches what the reader sees.
+func TestUserListsOrderByDisplayName(t *testing.T) {
+	t.Parallel()
+	st, ctx := orgTestStore(t)
+
+	// Usernames and display names sort in *opposite* orders, so a username sort
+	// and a display-name sort are distinguishable.
+	//   effective-name order: Alice, Carol, mmm-bob
+	//   username order:       aaa-carol, mmm-bob, zzz-alice
+	alice, err := st.CreateUser(ctx, "zzz-alice", "Alice")
+	if err != nil {
+		t.Fatalf("create alice: %v", err)
+	}
+	bob, err := st.CreateUser(ctx, "mmm-bob", "") // no display name → sorts as "mmm-bob"
+	if err != nil {
+		t.Fatalf("create bob: %v", err)
+	}
+	carol, err := st.CreateUser(ctx, "aaa-carol", "Carol")
+	if err != nil {
+		t.Fatalf("create carol: %v", err)
+	}
+	wantOrder := []int64{alice.ID, carol.ID, bob.ID}
+
+	// Org members (a separate creator is the admin; the three are plain members).
+	creator, err := st.CreateUser(ctx, "creator", "")
+	if err != nil {
+		t.Fatalf("create creator: %v", err)
+	}
+	org, err := st.CreateOrg(ctx, "Org", creator.ID)
+	if err != nil {
+		t.Fatalf("create org: %v", err)
+	}
+	for _, id := range []int64{alice.ID, bob.ID, carol.ID} {
+		if err := st.AddOrgMember(ctx, org.ID, id, "member"); err != nil {
+			t.Fatalf("add member: %v", err)
+		}
+	}
+	members, err := st.ListOrgMembers(ctx, org.ID)
+	if err != nil {
+		t.Fatalf("list members: %v", err)
+	}
+	// Admins first (the creator), then members in display-name order.
+	if len(members) == 0 || members[0].UserID != creator.ID {
+		t.Fatalf("admin should sort first, got %+v", members)
+	}
+	var gotMembers []int64
+	for _, m := range members[1:] {
+		gotMembers = append(gotMembers, m.UserID)
+	}
+	if !equalIDs(gotMembers, wantOrder) {
+		t.Fatalf("members not in display-name order: got %v, want %v", gotMembers, wantOrder)
+	}
+
+	// Repeater shares.
+	rep, err := st.CreateRepeater(ctx, &Repeater{
+		OwnerID: creator.ID, Name: "R", PublicKeyHex: strings.Repeat("a", 64),
+		RadioFreqHz: 1, RadioBwHz: 1, RadioSF: 11, RadioCR: 5,
+	})
+	if err != nil {
+		t.Fatalf("create repeater: %v", err)
+	}
+	for _, id := range []int64{bob.ID, carol.ID, alice.ID} {
+		if _, err := st.AddShare(ctx, rep.ID, id); err != nil {
+			t.Fatalf("add share: %v", err)
+		}
+	}
+	shares, err := st.ListShares(ctx, rep.ID)
+	if err != nil {
+		t.Fatalf("list shares: %v", err)
+	}
+	var gotShares []int64
+	for _, s := range shares {
+		gotShares = append(gotShares, s.UserID)
+	}
+	if !equalIDs(gotShares, wantOrder) {
+		t.Fatalf("shares not in display-name order: got %v, want %v", gotShares, wantOrder)
+	}
+}
+
+func equalIDs(a, b []int64) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if a[i] != b[i] {
+			return false
+		}
+	}
+	return true
+}