Editing Milo O'Shea (section)

=== Television ===
{| class = "wikitable sortable"
|-
! Year
! Title
! Role
! Notes
|-
|1951 || ''The Passing Show'' || Performer || Episode: "The Years of Change"
|-
|1957–1958 || ''[[Armchair Theatre]]'' || Performer || 2 episodes
|-
|1958 || ''[[Theatre Night]]'' || Shawn Keogh || Episode: "The Hearts a Wonderer"
|-
|1960 || ''[[Playhouse (British TV series)|ITV Television Playhouse]]'' || Performer || 3 episodes
|-
|1960 || ''On Trial'' || Charles Armstrong || Episode: "W.T. Stead"
|-
|1961 || ''[[The Play of the Week]]'' || Presenter || Episode: "Waiting for Godot"
|-
|1961 || ''[[No Hiding Place]]'' || Perkins || Episode: "Mr. and Mrs. Smith"
|-
|1962 || ''[[Out of This World (British TV series)|Out of This World]]'' || Jacob Luke || Episode: "Pictures Don't Lie"
|-
|1962 || ''[[Z-Cars]]'' || Caxton / Chauncey || 2 episodes
|-
|1963 || ''Maupassant'' || Brument || Episode: "Women and Money"
|-
|1963 || ''First Night'' || Benjy Spillane || Episode: "My One True Love"
|-
|1964 || ''[[Festival (British TV series)|Festival]]'' || Leopold Bloom || Episode: "Bloomsday"
|-
|1960–1965 || ''[[ITV Play of the Week]]'' || Performer || 4 episodes 
|-
|1965 || ''[[Drama 61-67]]'' || Sam Quilly || Episode: "Drama '65: Mrs Quilley's Murder Shoes"
|-
|1965 || ''[[Theatre 625]]'' || Mulligan || Episode: "Portrait of the North"
|-
|1966 || ''[[The Wednesday Play]]'' || Brother Arnold || Episode: "Silent Song"
|-
|1966 || ''[[Pardon the Expression]]'' || Uncle Mike || Episode: "Heads Down"
|-
|1966 || ''[[Thirty-Minute Theatre]]'' || Fred || Episode: "Friday Night's the Best Night"
|- 
|1967 || ''Uncle Charles'' || Renzo Phillipe || Episode: "Mrs. Phillipe is Hurt"
|-
|1968 || ''[[Journey to the Unknown]]'' || Matt Dystal || Episode: "The New People"
|-
|1965–1969 || ''[[Out of the Unknown]]'' || Monty/Henry || 2 episodes
|-
|1969 || ''[[Galton and Simpson|Galton and Simpson Comedy]]'' || Alec Hemphill || Episode: "Pity Poor Edie"
|-
|1970 || ''[[On the House (TV series)|On the House]]'' || Mr. McGonigle || "The Great McGonigle"
|-
|1970 || ''The Glorious Uncertainty'' || Sam Price || TV movie
|-
|1968–1971 || ''[[Me Mammy]]'' || Bunjy Kennefick || 21 episodes
|-
|1971 || ''[[Jackanory]]'' || Storyteller || 5 episodes
|-
|1971 || ''Andorra'' || The Teacher || TV movie
|-
|1972 || ''Tales from the Lazy Acre'' || Various roles || 7 episodes
|-
|1973 || ''[[And No One Could Save Her]]'' || Patrick Dooley || Television movie
|-
|1973 || ''[[The Protectors]]'' || Prince Carpiano || Episode: "A Case for the Right"
|-
|1973 || ''[[Orson Welles Great Mysteries]]'' || Father Crumlish || Episode: "In the Confessional"
|-
|1974 || ''[[QB VII (miniseries)|QB VII]]'' || Dr. Lotaki || 3 episodes
|-
|1968–1974 || ''[[Comedy Playhouse]]'' || Various Roles || 2 episodes
|-
|1974 || ''Microbes and Men'' || Paul Erlich || 2 episodes
|-
|1975 || ''My Son Rueben'' || Dennis Baxter || Episode: "Better to Have Loved and Lost"
|-
|1977 || ''The Best of Families'' || Patrick Rafferty || Mini-Series
|-
|1977 || ''[[Peter Lundy and the Medicine Hat Stallion|Peter Lundy <br />and the Medicine Hat Stallion]]'' || Brisly || TV movie
|-
|1980 || ''Portrait of a Rebel: <br />The Remarkable Mrs. Sanger'' || Higgins || TV movie
|-
|1980 || ''[[A Time for Miracles]]'' || Performer || TV movie
|-
|1984 || ''Two by Forsyth'' || Performer || TV movie
|-
|1984 || ''[[Jennifer Slept Here]]'' || Grandpa || Episode: "Life with Grandfather"
|-
|1984 || ''[[Ellis Island (miniseries)|Ellis Island]]'' || Casey O'Donnell || 3 episode miniseries
|-
|1985 || ''[[Arena (An Absurd Notion)]]'' || Duran Duran || Short video
|-
|1986 || ''[[St. Elsewhere]]'' || Brendan Connelly || Episode: "Lost Weekend"
|-
|1987 || ''[[Broken Vows (1987 film)|Broken Vows]]'' || Monsignor Casey || TV movie
|-
|1987 || ''Angel in Green'' || Father Mahon || TV movie
|-
|1987 || ''[[Once a Hero]]'' || Abner Bevis || 3 episodes
|-
|1987 || ''[[Who's the Boss]]'' || Judge Kresheck || Episode: "Car and Driver"
|-
|1987 || ''[[The Golden Girls]]'' || Buddy Rourke || Episode: "Charlie's Buddy"
|-
|1988 || ''[[Beauty and the Beast (1987 TV series)|Beauty and the Beast]]'' || Evan Brannigan || Episode: "Temptation"
|-
|1991 || ''[[The Commish]]'' || Frank Atkins || Episode: "No Greater Gift"
|-
|1992 || ''[[Cheers]]'' || Uncle Roger || Episode: "An Old-Fashioned Wedding"
|-
|1993 || ''[[Murder in the Heartland]]'' || Clem Gaughan || 2 episodes
|-
|1995 || ''[[Frasier]]'' || Dr. Schachter || Episode: "Shrink Rap"
|-
|1996 || ''[[Early Edition]]'' || Sherman || Episode: "Pilot"
|-
|1998 || ''[[Spin City]]'' || Father Larry || Episode: "The Paul Bearer"
|-
|1999 || ''[[Swing Vote (1999 film)|Swing Vote]]'' || Justice Greene || TV movie
|-
|1999 || ''[[Oz (TV series)|Oz]]'' || Dr. Frederick Garvey || 3 episodes
|-
|2000 || ''[[Madigan Men]]'' || Milo || 2 episodes
|-
|2003–2004 || ''[[The West Wing]]'' || Chief Justice Ashland || 2 episodes, (final appearance)
|}