Joseph Nicholas Weber (June 21, 1865 – December 12, 1950) was a Hungarian-born American musician and labor union leader.
He was a delegate to the union's national conference in 1891, at which he argued that it should affiliate to the American Federation of Labor (AFL).
In Cincinnati, he was elected to the executive of the union, but the following year, he was part of the split which formed the American Federation of Musicians (AFM).
He soon realized that the union would be weakened without their involvement, but he created parallel locals for black and white musicians.
He led opposition to the use of mechanical instruments, or those which could replace multiple musicians, such as Wurlitzer organs, and argued that film talkies were a passing fad.