He attended Sir John A. Macdonald Collegiate Institute in Scarborough, Ontario.

Educated and trained as an actor in Canada at the Ryerson University School of Theatre in Toronto, McCormack has been appearing in television productions since his debut in 1986.

He played Col. Francis Clay Mosby in the 1-hour Western television miniseries Lonesome Dove: The Series (1994), and Lonesome Dove: The Outlaw Years (1995). He also played the immortal Matthew McCormick in the Highlander: The Series episode "Manhunt" (1996).

His role as gay lawyer Will Truman in the NBC sitcom Will & Grace from 1998 until 2006 has brought him widespread recognition. Nominated for Emmy Awards on three occasions for this role, he won the award for Outstanding Lead Actor in a Comedy in 2001.

During the 2001 Broadway season, McCormack briefly portrayed Prof. Harold Hill (replacing Craig Bierko) in the Susan Stroman revival of The Music Man while on hiatus from Will & Grace. In August 2002, as part of the Hollywood Bowl's Summer Concert Series, he reprised the role for a one-night only appearance in which he and other artists re-created the songs from the show.

McCormack starred in the off-Broadway play Some Girl(s) with Fran Drescher in 2006 and is also executive producer of the new Lifetime comedy, Lovespring International.

McCormack recorded a song, The Greatest Discovery, which was written by Elton John and Bernie Taupin in 1970, for the album Unexpected Dreams: Songs from the Stars. He also wrote and sang a song called "Living with Grace" for the 2004 soundtrack to Will & Grace with piano music provided by Barry Manilow. McCormack attended high school with David Furnish, Elton John's partner.

Eric McCormack has been married to Janet Leigh Holden since 1997; they have a son, Finnigan Holden McCormack, born on July 1, 2002 in Los Angeles.

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