Sister of critically acclaimed singer/songwriter Mary Margaret O'Hara.
She was part of the group Northern Lights who sang the song "Tears Are Not Enough" which was on the "We Are The World" album.
Crowned Queen of Comedy after her years as a regular on SCTV (1976). Catherine O'Hara has an almost religious cult following around the world.
A high school friend of Robin Duke at Burnhamthorpe Collegiate in Etobicoke, Ontario, Canada. They first acted together in a school production of "Harvey".
Has 2 sons, Matthew Welch (born 1994) and Luke Welch (born 1997), with Bo Welch.
Is one of 7 children.
She is a naturalized a U.S. citizen.
Third generation Irish/Canadian/Catholic.
Wrote SCTV (1976)'s famous sketch "High-Q", considered one of the funniest sketches on SCTV (1976).
Composed the two songs she and her sister Mary Margaret O'Hara and friend Robin Duke performed in The Last Polka (1985).
Owns a cottage (along with her husband Bo Welch) in Muskoka, Ontario.
Learned to play the autoharp for her role in A Mighty Wind (2003).
Gave a tearful eulogy at the funeral for John Candy.
Went to the same high school as fellow Canadian entertainer Dave Foley.
Auditioned for the role of Jane Craig in Broadcast News (1987). Holly Hunter was cast instead.
Received a star on Canada's Walk of Fame in June 2007.
Began working at Toronto's "Second City" in 1973 as a waitress. Her brother Marc O'Hara, and sister Mary Margaret O'Hara also had jobs there.
Does an excellent impersonation of Katharine Hepburn, as seen on SCTV (1976).
Often cast in Tim Burton films. He directed her in Beetlejuice (1988) and Frankenweenie (2012), and she provided voices for The Nightmare Before Christmas (1993), which Burton produced. She also starred in Lemony Snicket's A Series of Unfortunate Events (2004) that he originally was set to direct.
Has a congenital condition called "Situs Inversus" in which the organs of the chest and abdomen are arranged in a perfect mirror image reversal of the normal positioning. Most people with situs inversus have no medical symptoms or complications resulting from the condition and it only occurs in less than 1 in 10,000.
Her acting mentor was Comedian Gilda Radner.
In 2013, she participated in "Danny Elfman's Music from the Films of Tim Burton" to perform "Sally's Song" from The Nightmare Before Christmas (1993). She received a standing ovation when she entered the stage, as well as when she left.
Pictured on one of a set of five nondenominated Canadian commemorative postage stamps honoring Great Canadian Comedians, issued 29 August 2014. In addition to the main portrait, she is shown in her roles as Delia Deetz in Beetlejuice (1988), Marilyn Hack in For Your Consideration (2006), and Mickey Crabbe in A Mighty Wind (2003). Others honored in this set are Jim Carrey, Mike Myers, Martin Short, and Olivier Guimond. Price of each stamp on day of issue was 85¢.
After securing Macaulay Culkin, Joe Pesci and Daniel Stern for Home Alone (1990), Chris Columbus felt confident enough to cast actors who were his heroes growing up, like O'Hara after seeing her work on SCTV (1976) as well as John Heard, and Tim Curry and Rob Schneider on Home Alone 2: Lost in New York (1992) because they were all open to the films.
Revealed in 2014 that Macaulay Culkin, her on-screen son from Home Alone (1990) still calls her "Mom".
Stars in two Holiday classics, Home Alone (1990) and The Nightmare Before Christmas (1993), that are annually given a theatrical December-re-release around the world.
Has appeared in two unconnected adaptations of Daniel Handler's book series "A Series of Unfortunate Events"; As Justice Strauss in Lemony Snicket's A Series of Unfortunate Events (2004) and as Dr. Georgina Orwell in A Series of Unfortunate Events (2016).
Turned down a part in Mascots (2016), by her frequent collaborator Christopher Guest, due to scheduling conflicts with Schitt's Creek (2015). It was his first film since The Big Picture (1989) she didn't star in.
Shares a 40-year friendship with Eugene Levy; together they have appeared in several projects: SCTV (1976), SCTV Network (1981), SCTV Channel (1983), Nothing Personal (1980), The Last Polka (1985),Double Negative (1980), I, Martin Short, Goes Hollywood (1989), Waiting for Guffman (1996), Best in Show (2000), Over the Hedge (2006), For Your Consideration (2006), A Mighty Wind (2003) and .
Appeared in three films with Joe Pesci: Betsy's Wedding (1990), Home Alone (1990) and Home Alone 2: Lost in New York (1992).
Her good friend John Candy passed away on her 40th birthday. She gave a tearful eulogy at his funeral.
She has known Eugene Levy since her days onSCTV (1976) and has known Dan Levy since he was a baby.
Luke Perry died on Catherine's 65th birthday and her good friend and SCTV alumni John Candy died on her 40th birthday.