The Leader of the Opposition in the Legislative Assembly of the Province of New Brunswick, Canada is a title traditionally held by the leader of the largest party not in government.

The Leader of the Opposition is often seen as the alternative Premier to the present incumbent, and heads a rival alternative government known as the Shadow Cabinet or Opposition Front Bench.

A cohesive and consistent official opposition first formed when A. G. Blair formed the Liberal party in the early 1880s. Previously oppositions occasionally organized over major issues such as anti-prohibitionists led by John Hamilton Gray in the mid-1850s, and pro-Confederationists under Charles Fisher in 1865-1866.

Opposition Leaders

Liberal Leader

• Andrew G. Blair (1879-1883)

Conservative Leaders

• Daniel L. Hanington (1883-1892)
• Alfred Augustus Stockton (1892-1899)
• John Douglas Hazen (1899-1908)

Liberal Leaders

• Clifford W. Robinson (1908-1912)
• Arthur Bliss Copp (1912-1912)
• Louis-Auguste Dugal (1912-1917)

Conservative Leaders

• James Alexander Murray (1917-1920)
• John B. M. Baxter (1920-1921)
• Charles D. Richards (1921-1925)

Liberal Leaders

• Peter Veniot (1925-1926)
• Allison Dysart (1926-1935)

Conservative Leader

• Frederick C. Squires (1935-1939)

Progressive Conservative Leaders

• Hugh H. Mackay (1940-1948)
• Hugh John Flemming (1949-1952)

Liberal Leaders

• Austin Claude Taylor (1952-1957)
• Joseph E. Connolly (1957-1958)
• Louis Robichaud (1958-1960)

Progressive Conservative Leaders

• Hugh John Flemming (1960-1960)
• Cyril Sherwood (1960-1966)
• Charles Van Horne (1967-1967)
• Richard Hatfield (1967-1970)

Liberal Leaders

• Louis Robichaud (1970-1971)
• Robert Higgins (1971-1978)
• Joseph Daigle (1978-1981)
• Doug Young (1982-1983)
• Ray Frenette (1983-1985)
• Shirley Dysart (1985-1985)
• Frank McKenna (1985-1987)
• Camille Thériault (1987-1991) The Liberals won all seats in the Legislative Assembly in the 1987 Election. Camille Thériault was appointed by Premier Frank McKenna as Opposition Leader to ensure proper Parliamentary functions. During that time, no opposition leader, in the sense of the office being held by the leader of the largest non-governing political party, existed.

Confederation of Regions Leaders

• Danny Cameron (1991-1995)
• Ab Rector (1995-1995)
• Greg Hargrove (1995-1995)

Progressive Conservative Leaders

• Bernard Valcourt (1995-1997)
• Elvy Robichaud (1997-1998)
• Bernard Lord (1998-1999)

Liberal Leaders

• Camille Thériault (1999-2001)
• Bernard Richard (2001-2002)
• Shawn Graham (2002-2006)

Progressive Conservative Leaders

• Bernard Lord (2006-2007)
• Jeannot Volpé (2007-2008)
• David Alward (2008-2010)

Liberal Leaders

• Victor Boudreau (2010-2013)
• Brian Gallant (2013-2014)

Progressive Conservative Leader

• Bruce Fitch (2014-Present)