| Father's Little Dividend | 1951 | Herbert Dunstan | Movie |
| Payment on Demand | 1951 | Arnold Barton (uncredited) | Movie |
| Submarine Command | 1951 | Rear Adm. Joshua Rice | Movie |
| I Love Lucy | 1951 | Judge | TV Show |
| No Questions Asked | 1951 | Henry Manston | Movie |
| Father of the Bride | 1950 | Herbert Dunstan | Movie |
| Samson and Delilah | 1949 | Targil | Movie |
| Task Force | 1949 | Adm. Ames | Movie |
| The Fountainhead | 1949 | Chairman | Movie |
| Call Northside 777 | 1948 | Parole Board Chairman | Movie |
| Command Decision | 1948 | Congressman Stone | Movie |
| Up in Central Park | 1948 | Big Jim Fitts | Movie |
| High Wall | 1947 | Dr. Philip Dunlap | Movie |
| Life with Father | 1947 | Dr. Humphries | Movie |
| Possessed | 1947 | Dr. Ames | Movie |
| That Hagen Girl | 1947 | Trenton Gateley | Movie |
| The Beginning or the End | 1947 | Dr. Arthur H. Compton | Movie |
| The Long Night | 1947 | Chief of Police Bob McManus | Movie |
| Black Gold | 1947 | Don Toland | Movie |
| From This Day Forward | 1946 | Tim Bagley (uncredited) | Movie |
| It's a Wonderful Life | 1946 | Senior Angel (voice, uncredited) | Movie |
| Notorious | 1946 | Walter Beardsley | Movie |
| The Strange Woman | 1946 | Rev. Thatcher | Movie |
| Night in Paradise | 1946 | High Priest | Movie |
| Boys' Ranch | 1946 | Judge Henderson | Movie |
| The Walls Came Tumbling Down | 1946 | Bishop Martin | Movie |
| Don't Fence Me In | 1945 | Henry Bennett - aka Harry Benson | Movie |
| Mildred Pierce | 1945 | Inspector Peterson | Movie |
| Pride of the Marines | 1945 | Capt. Burroughs | Movie |
| The Valley of Decision | 1945 | Richard Kane (uncredited) | Movie |
| Week-End at the Waldorf | 1945 | House Detective Blake | Movie |
| Behind City Lights | 1945 | Curtis Holbrook | Movie |
| Ali Baba and the Forty Thieves | 1944 | Caliph Hassan | Movie |
| Buffalo Bill | 1944 | Sen. Frederici | Movie |
| Cobra Woman | 1944 | MacDonald | Movie |
| Thirty Seconds Over Tokyo | 1944 | General (uncredited) | Movie |
| Roger Touhy, Gangster | 1944 | Riley (as Maroni Olsen) | Movie |
| Air Force | 1943 | Colonel Blake | Movie |
| Madame Curie | 1943 | President of Businessman's Board (uncredited) | Movie |
| Mission to Moscow | 1943 | Col. Faymonville | Movie |
| The Song of Bernadette | 1943 | Chaplain (uncredited) | Movie |
| We've Never Been Licked | 1943 | Commandant | Movie |
| My Favorite Spy | 1942 | Major Allen | Movie |
| Nazi Agent | 1942 | Brenner | Movie |
| Reunion in France | 1942 | Paul Grebeau | Movie |
| Ship Ahoy | 1942 | Inspector Davis (uncredited) | Movie |
| The Glass Key | 1942 | Ralph Henry | Movie |
| Mrs. Wiggs of the Cabbage Patch | 1942 | Dr. Olcott | Movie |
| Sundown Jim | 1942 | Andrew Barr | Movie |
| Dangerously They Live | 1941 | Mr. Goodwin | Movie |
| Dive Bomber | 1941 | Senior Surgeon at San Diego | Movie |
| One Foot in Heaven | 1941 | Dr. John Romer | Movie |
| Life with Henry | 1941 | Sylvanus Q. Sattherwaite | Movie |
| Three Sons o' Guns | 1941 | Philip Talbot | Movie |
| Respect the Law | 1941 | Dr. Walter Terriss | Short Film |
| Brigham Young | 1940 | Doc Richards | Movie |
| East of the River | 1940 | Judge R.D. Davis | Movie |
| If I Had My Way | 1940 | Mr. Blair | Movie |
| Santa Fe Trail | 1940 | Robert E. Lee | Movie |
| Virginia City | 1940 | Cameron | Movie |
| Brother Rat and a Baby | 1940 | Maj. Terry | Movie |
| Allegheny Uprising | 1939 | Calhoon | Movie |
| Dust Be My Destiny | 1939 | Slim Jones | Movie |
| Invisible Stripes | 1939 | Prison Warden | Movie |
| Rose of Washington Square | 1939 | Major Buck Russell | Movie |
| Susannah of the Mounties | 1939 | Supt. Andrew Standing | Movie |
| The Three Musketeers | 1939 | Bailiff | Movie |
| Sons of Liberty | 1939 | Robert Morris -- Superintendent of Finance (uncredited) | Short Film |
| Code of the Secret Service | 1939 | Friar Parker | Movie |
| Homicide Bureau | 1939 | Capt. Haines | Movie |
| That's Right - You're Wrong | 1939 | Jonathan Forbes | Movie |
| The Bill of Rights | 1939 | Royal Governor Dunmore (as Moroni Olson) | Short Film |
| Barricade | 1939 | Shanghai Managing Editor | Movie |
| Off the Record | 1939 | Juvenal Court Judge | Movie |
| Gold Is Where You Find It | 1938 | Senator George Hearst | Movie |
| Kentucky | 1938 | John Dillon (1938) | Movie |
| Kidnapped | 1938 | Douglas (as Maroni Olsen) | Movie |
| Marie Antoinette | 1938 | Bearded Leader of the People (uncredited) | Movie |
| Submarine Patrol | 1938 | The Fleet Captain | Movie |
| That Certain Age | 1938 | Fullerton's Associate (uncredited) | Movie |
| There Goes My Heart | 1938 | Fisherman (uncredited) | Movie |
| What Do You Think?: Tupapaoo | 1938 | Kurt Larsen (the trader) | Short Film |
| Adventure's End | 1937 | Rand Husk | Movie |
| Manhattan Merry-Go-Round | 1937 | Jonathan (uncredited) | Movie |
| Snow White and the Seven Dwarfs | 1937 | Magic Mirror (voice, uncredited) | Movie |
| The Last Gangster | 1937 | Detective Danny Shea (uncredited) | Movie |
| The Life of Emile Zola | 1937 | Capt. Guignet (uncredited) | Movie |
| The Soldier and the Lady | 1937 | Tartar Chief (voice, uncredited) | Movie |
| M'Liss | 1936 | Jake | Movie |
| Mary of Scotland | 1936 | John Knox | Movie |
| The Plough and the Stars | 1936 | Irish Leader | Movie |
| The Farmer in the Dell | 1936 | Chester Hart | Movie |
| Grand Jury | 1936 | Davis, Taylor's Bodyguard | Movie |
| Mummy's Boys | 1936 | Dr. Edward Sterling | Movie |
| Two in Revolt | 1936 | Cyrus Benton | Movie |
| The Witness Chair | 1936 | Lieutenant Poole | Movie |
| Yellow Dust | 1936 | Missouri | Movie |
| Annie Oakley | 1935 | William 'Buffalo Bill' Cody | Movie |
| The Three Musketeers | 1935 | Porthos | Movie |
| Seven Keys to Baldpate | 1935 | Mayor Jim Cargan | Movie |
| We're Only Human | 1935 | Inspector J.R. Curran | Movie |
| Death Takes a Holiday | 1934 | Religious Dignitary (uncredited) | Movie |
