I Was a Male War Bride (1949) .... Capt. Henri Rochard
... aka Howard Hawks' I Was a Male War Bride (1949) (USA: complete title)
... aka You Can't Sleep Here (1949) (UK)

Every Girl Should Be Married (1948) .... Dr. Madison Brown

Mr. Blandings Builds His Dream House (1948) .... Jim Blandings

Bishop's Wife, The (1947) .... Dudley

Bachelor and the Bobby-Soxer, The (1947) .... Richard (Dick) Nugent, Artist
... aka Bachelor Knight (1947) (UK)

Notorious (1946) .... T.R. Devlin
... aka Alfred Hitchcock's Notorious (1946)

Night and Day (1946) .... Cole Porter

Without Reservations (1946) (uncredited) .... Cameo appearance
... aka Thanks God, I'll Take It From Here (1946)

Arsenic and Old Lace (1944) .... Mortimer Brewster
... aka Frank Capra's 'Arsenic and Old Lace' (1944) (USA: complete title)

None But the Lonely Heart (1944) .... Ernie Mott

Once Upon a Time (1944) .... Jerry Flynn

Destination Tokyo (1943) .... Captain Cassidy

Mr. Lucky (1943) .... Joe Adams

Once Upon a Honeymoon (1942) .... Pat O'Toole

Talk of the Town, The (1942) .... Leopold Dilg
... aka George Stevens' The Talk of the Town (1942) (USA: complete title)

Suspicion (1941) .... Johnnie Aysgarth

Penny Serenade (1941) .... Roger Adams

Philadelphia Story, The (1940) .... C. K. Dexter Haven

Howards of Virginia, The (1940) .... Matt Howard
... aka Tree of Liberty, The (1940) (UK)

My Favorite Wife (1940) .... Nick

His Girl Friday (1940) .... Walter Burns (editor, Chicago Morning Post)

In Name Only (1939) .... Alec Walker

Only Angels Have Wings (1939) .... Geoff Carter

Gunga Din (1939) .... Sgt. Archibald Cutter

Topper Takes a Trip (1939) (uncredited) .... George Kerby

Holiday (1938) .... John 'Johnny' Case
... aka Free to Live (1938) (UK)
... aka Unconventional Linda (1938) (UK: reissue title)

Bringing Up Baby (1938) .... Dr. David Huxley

Awful Truth, The (1937) .... Jerry Warriner

Toast of New York, The (1937) .... Nick Boyd

Topper (1937) .... George Kerby

When You're in Love (1937) .... Jimmy Hudson
... aka For You Alone (1937) (UK)

Amazing Quest of Ernest Bliss, The (1936) .... Ernest Bliss
... aka Amazing Adventure, The (1937) (USA: reissue title)
... aka Amazing Quest, The (1936)
... aka Riches and Romance (1936)
... aka Romance and Riches (1937) (USA)

Wedding Present (1936) .... Charlie

Suzy (1936) .... Capt. Andre Charville

Big Brown Eyes (1936) .... Danny Barr

Sylvia Scarlett (1935) .... Jimmy 'Monk' Monkley

Pirate Party on Catalina Isle (1935) (uncredited) .... Cameo appearance

Last Outpost, The (1935) .... Michael Andrews

Wings in the Dark (1935) .... Ken Gordon

Enter Madame (1935) .... Gerald Fitzgerald

Ladies Should Listen (1934) .... Julian De Lussac

Kiss and Make Up (1934) .... Dr. Maurice Loman

Born to Be Bad (1934) .... Malcolm Trevor

Thirty Day Princess (1934) .... Porter Madison III