Borden Ladner Gervais LLP (abbreviated as BLG) is a leading, full-service law firm in Canada with almost 900 lawyers, intellectual property agents and other professionals.

With two hundred years of history going back to the 1823 founding of McMaster Gervais, it has offices in Toronto, Montréal, Vancouver, Ottawa, and Calgary.

Sean Weir served as the firm's first National Managing Partner until 2018, and was succeeded in the position by John Murphy of the Montréal office.

[6] [7] Over the years, the firm has produced two Prime Ministers, an Attorney General, appellate court justices, law school deans, an ambassador to the United States, and directors of numerous national corporations.

[8] On March 1, 2000,[9] the law firms of McMaster Gervais of Montreal, Borden & Elliot of Toronto, Ladner Downs of Vancouver, Howard Mackie of Calgary, and Scott & Aylen of Ottawa, merged to create BLG.

At the time of the merger in 2000, Borden & Elliot was a full-service firm with one of the largest litigation practices in the country, and employed 668 people including more than 230 professionals.

The Montréal firm McMaster Gervais was founded in 1823 when the Honourable William Badgley opened his law practice at the age of 22.

The Calgary law firm Howard, Mackie was founded in 1888 by William L. Bernard, QC, and was one of the largest in Western Canada.

[24] The firm supports a variety of activities by providing pro bono legal services, fundraising and volunteer programs through its ESG@BLG initiative.