Diane Lemieux (born September 22, 1961) is a Canadian politician and administrator who serves as the president and chief executive officer of the Commission de la construction du Québec.

Her early activist experiences involved advocating for women's rights, first for sexual assault victims, then in her role as president of the Conseil du statut de la femme (1996-1998).

Following that, she was a member of the Assemblée nationale du Québec (National Assembly of Quebec) (1998-2007) for nearly 10 years, under the governments of Lucien Bouchard and Bernard Landry.

After a year with Vision Globale, she returned to public service as the director of the Office of the Mayor and president of the executive committee of the city of Montreal.

After graduating from the Faculty of Law of the Université de Sherbrooke[1] in 1983, she began her professional life, first through a social commitment to women's issues, with a particular focus on sexual assault victims.

[7] In 2011, she became the first woman to hold the position of president and chief executive officer of the Commission de la construction du Québec (CCQ) .

[9] In June 2012, the 600 administrative employees of the CCQ represented by the Syndicat des employés professionnels et de bureau (SEPB-Québec), who had been without a collective agreement since December 2009, went on strike.

Under her leadership, the CCQ has seen many changes, notably the establishment of the Carnet référence construction (to replace union hiring) and revised investigative methods.