James Kirby (c. 1865 – October 8, 1915) was an American labor leader and president of the United Brotherhood of Carpenters and Joiners of America from 1913 to 1915.
He served until 1908, when the Alliance affiliated with the American Federation of Labor and changed its name to the Building Trades Department (BTD).
In 1910, Carpenters president William Huber appointed him "general organizer" for the international union.
When he was elected president of the United Brotherhood, he moved to Indianapolis with his family.
His funeral was attended by trades union officials from all over the United States.