Adam Brown Crosby (12 May 1856) was a Canadian politician.
Born in Irvine, Scotland[contradiction], he emigrated as a child with his parents, Adam Crosby and Jane Brown, and settled first at Sydney Mines and then Cow Bay (Port Morien) Nova Scotia. His father worked at the Gowrie Mine in Port Morien that would later employ Adam and Adam’s brother James. Realizing that mining was not for him, Adam B. Crosby moved to Halifax in 1880 and worked as a sales clerk and then as a ship broker. He was elected several times as mayor of Halifax, serving from 1902–1905, and again from 1908-1909. He was elected as the Conservative Member of Parliament for Halifax on October 26, 1908, serving one term before being defeated in the general election of September 21, 1911. Sir Robert Borden, Prime Minister of Canada, appointed Crosby to the Senate on January 20, 1917, upon the death of Senator William MacDonald, after whom Glace Bay’s “Senator’s Corner” is named. Senatory Crosby served in the Senate for seven years until his death on March 10, 1921.