The Leader of the Official Opposition in the House of Commons (French: Leader parlementaire de l'Opposition officielle), more commonly known as the Opposition House Leader, is a member of the Official Opposition, not to be confused with the Leader of the Official Opposition, but is generally a senior member of the frontbench. The House Leader is responsible for questioning the Government House Leader on the forthcoming business of the House of Commons, negotiating with the Government House Leader and other parties' house leaders on the progress of business in the House, and managing the Official Opposition's business in the House of Commons.

The position of Opposition House Leader evolved in the 1950s as each Opposition party began to designate a particular MP to question the Government House Leader on upcoming House business. The title of Opposition House Leader became official in 1963, and in 1974, a special annual indemnity was attached to the position of House Leader in each of the opposition parties.

Notable Opposition House Leaders include Herb Gray of the Liberal Party (also a Government House Leader) and Erik Nielsen of the Progressive Conservative Party.

Opposition House Leaders

Liberal Opposition House Leader

Leader of the Official Opposition Louis St. Laurent October 14, 1957 to January 16, 1958

• Lionel Chevrier (October 14, 1957 to cont.)

Leader of the Official Opposition Lester B. Pearson January 16, 1958 to February 5, 1963

• Lionel Chevrier (cont. to February 5, 1963)

Progressive Conservative Opposition House Leaders

Leader of the Official Opposition John G. Diefenbaker May 16, 1963 to September 8, 1967

• Gordon Churchill (May 16, 1963 to April 21, 1965)
• Michael Starr (April 22, 1965 to cont.)

Acting Leader of the Official Opposition Michael Starr September 9, 1967 to November 5, 1967

• Michael Starr (cont. to cont.)

Leader of the Official Opposition Robert Stanfield November 9, 1967 to February 21, 1976

• Michael Starr (cont. to April 23, 1968)
• Ged Baldwin (July 27, 1968 to September 20, 1973)
• Thomas Bell (September 21, 1973 to May 9, 1974)
• Ged Baldwin (2nd time) (August 14, 1974 to cont.)

Leader of the Official Opposition Joe Clark February 22, 1976 to June 3, 1979

• Ged Baldwin (2nd time) (cont. to February 24, 1976)
• Walter Baker (February 25, 1976 to March 26, 1979)

Leader of the Official Opposition Pierre Elliot Trudeau June 4 1979 to March 2, 1980

• Allan MacEachen (October 9, 1979 to December 14, 1979)

Leader of the Official Opposition Joe Clark March 3, 1980 to February 1, 1983 and acting until February 8, 1983

• Walter Baker (2nd time) (April 14, 1980 to September 8, 1981)
• Erik Nielsen (September 9, 1981 to February 8, 1983)

Acting Leader of the Official Opposition Erik Nielsen February 10, 1983 to August 28, 1983

• Doug Lewis (February 10, 1983 to cont.)

Leader of the Official Opposition Brian Mulroney August 29, 1983 to September 16, 1984

• Doug Lewis (cont. to September 6, 1983)
• Erik Nielsen (2nd time) (September 7, 1983 to April 5, 1984)
• Ray Hnatyshyn (April 6, 1984 to July 9. 1984)

Liberal Opposition House Leaders

Leader of the Official Opposition John Turner September 17, 1984 to February 7, 1990

• Herb Gray (September 18, 1984 to February 7, 1990)

Acting Leader of the Official Opposition Herb Gray February 8, 1990 to December 21, 1990

• Jean-Robert Gauthier (February 8, 1990 to cont.)

Leader of the Official Opposition Jean Chrétien December 22, 1990 to November 3, 1993

• Jean-Robert Gauthier (cont. to January 29, 1991)
• David Dingwall (January 30, 1991 to May 8, 1993)

Bloc Québécois Opposition House Leaders

Leader of the Official Opposition Lucien Bouchard November 4, 1993 to January 14, 1996

• Michel Gauthier (November 10, 1993 to cont.)

Acting Leader of the Official Opposition Gilles Duceppe January 15, 1996 to February 16, 1996

• Michel Gauthier (cont. to February 16, 1996)

Leader of the Official Opposition Michel Gauthier February 17, 1996 to March 15, 1997

• Gilles Duceppe (February 17, 1996 to March 15, 1997)

Leader of the Official Opposition Gilles Duceppe March 15, 1997 to June 2, 1997

• Suzanne Tremblay (March 17, 1997 to April 25, 1997)

Reform Party Opposition House Leaders

Leader of the Official Opposition Preston Manning June 2, 1997 to March 26, 2000

• Randy White (June 20, 1997 to January 30, 2000)
• Chuck Strahl (January 31, 2000 to cont.)

Canadian Alliance Opposition House Leaders

Leader of the Official Opposition Deborah Grey March 27, 2000 to July 7, 2000 and then acting until September 10, 2000

• Chuck Strahl (cont. to cont.)

Leader of the Official Opposition Stockwell Day September 11, 2000 to December 11, 2001

• Chuck Strahl (cont. to April 24, 2001)
• John Reynolds (April 24, 2001 to cont.)

Leader of the Official Opposition John Reynolds December 12, 2001 to May 20, 2002

• John Reynolds (cont. to December 17, 2001)
• Randy White (2nd time) (December 18, 2001 to April 3, 2002)
• John Reynolds (2nd time) (April 4, 2002 to cont.)

Leader of the Official Opposition Stephen Harper May 21, 2002 to January 8, 2004

• John Reynolds (2nd time) (cont. to December 22, 2003)
  • none between December 23, 2003 and January 8, 2004

Conservative Party Opposition House Leaders

Acting Leader of the Official Opposition Grant Hill January 9, 2004 to March 21, 2004

• Loyola Hearn (January 9, 2004 to March 21, 2004)

Leader of the Official Opposition Stephen Harper March 22, 2004 to February 5, 2006

• John Reynolds (3rd time) (March 22, 2004 to January 27, 2005)
• Jay Hill (January 28, 2005 to February 5, 2006)

Liberal Party Opposition House Leaders

Leader of the Official Opposition Bill Graham February 6, 2006 to December 1, 2006

• Ralph Goodale (February 10, 2006 to cont.)

Leader of the Official Opposition Stéphane Dion December 2, 2006 to December 9, 2008

• Ralph Goodale (cont. to cont.)

Leader of the Official Opposition Michael Ignatieff December 10, 2008 to May 1, 2011

• Ralph Goodale (cont. to September 6, 2010)
• David McGuinty (September 7, 2010 to March 26, 2011)

New Democratic Party Opposition House Leaders

Leader of the Official Opposition Jack Layton May 2, 2011 to August 22, 2011

• Thomas Mulcair (May 26, 2011 to cont.)

Acting Leader of the Official Opposition Nycole Turmel July 28, 2011 to August 22, 2011

• Thomas Mulcair (cont. to cont.)

Leader of the Official Opposition Nycole Turmel August 23, 2011 to March 23, 2012

• Thomas Mulcair (cont. to October 12, 2011)
• Joe Comartin (October 13, 2011 to cont.)

Leader of the Official Opposition Thomas Mulcair March 24, 2012 to October 19, 2015

• Joe Comartin (cont. to April 19, 2012)
• Nathan Cullen (April 20, 2012 to March 20, 2014)
• Peter Julian (March 24, 2014 to October 20, 2015)

Conservative Party Opposition House Leader

Acting Leader of the Official Opposition Rona Ambrose November 5, 2015 to Present

• Andrew Scheer (November 18, 2015 to Present)