Cornelius Joseph "Neil" Haggerty (January 10, 1894 – October 10, 1971) was an American labor union leader.

Born in Boston, Haggerty worked briefly as a singer before completing an apprenticeship as a lather.

He served in the United States Navy during World War I, then returned to lathing, moving to Los Angeles in 1921.

In 1960, he became president of the Building and Construction Trade Department of the AFL-CIO, in which role he often came into conflict with Walter P. Reuther.

He opposed wage controls, and argued for the training of more black construction workers.