Philip M. Kleinfeld (June 19, 1894 on the Lower East Side of New York City – January 11, 1971 in Manhattan, New York City) was an American lawyer and politician from New York.
Kleinfeld was the son of Max (c.1872–1939) and Bertha Kleinfeld (?-1964). He graduated from New York Law School in 1916, was admitted to the New York bar, and practiced with Samuel Kramer under the firm name of Kramer & Kleinfeld in New York City. He married Rose Meyers. He was the brother of Clara Kleinfeld and Yette Levine and the Uncle of New York Superior Court Justice Joseph Levine.
Kleinfeld was elected to the New York State Assembly (Kings County, 16th District) in 1922. He was also a member of the New York State Senate (4th District) from 1923 to 1941, sitting in the 146th, 147th, 148th, 149th, 150th, 151st, 152nd, 153rd, 154th, 155th, 156th, 157th, 158th, 159th, 160th, 161st, 162nd and 163rd New York State Legislatures. During his tenure as senator, he wrote a bill to extend the right of jury service to women. He was also a delegate to the New York State Constitutional Convention of 1938.