Peter J. Hamill (c. 1885 – January 13, 1930) was an American politician who served in the New York State Assembly from 1917 to his death.

In late 1929 he was chosen as the Minority Leader of the Assembly to replace Maurice Bloch, who had died of complications from an appendectomy.

Hamill was forced out of his house on 585 Broome Street in 1923 when it was demolished to make way for an approach to the Holland Tunnel.

[1] Tanahey and Whelan eventually respectively moved and seconded his leadership,[3] and Hamill was elected as the leader on April 29.

On January 23, 1930, his widow Matilda Van Axen Hamill was appointed as Supervisor of Investigators for the new Crime Prevention Bureau of the New York City Police Department at a salary of $4,500 ($73,000 in 2021) a year.