Philip O. Mastin Jr. (May 27, 1930 – November 28, 2012) was an American politician from Pontiac, Michigan.^[1][2]

Mastin served as a Democrat in the Michigan House of Representatives' 69th District and then in the Michigan State Senate's 8th District.^[3] He was removed from his state senate seat after losing a recall election in 1984, becoming the first Michigan state legislator to be successfully recalled.^[4][5]

Mastin voted in favor of a 38% tax increase (from 4.6% to 6.35%) in order to address the state budget crisis, ^[5] which led to the anti-tax group Citizens Against Unnecessary State Expenditures (CAUSE) lobbying for his removal.^[7][8] Mastin was in the first year of his first Michigan State Senate term when the election to recall him took place on November 22, 1983.^[8] The event earned national attention for being the first time a Michigan state legislator was recalled from office by their constituents.^[4][5][8]

Sen. David Serotkin of Mt. Clemens was recalled soon after, with the events ultimately flipping majority control in the Michigan State Senate to the Republican Party for the first time in ten years.^[9][5] Republicans held this majority until the 2022 election.^[10] Governor James Blanchard, also a Democrat, faced and beat recall efforts from the same anti-tax group.^[7] Other recall efforts were stopped with court challenges.^[11]

Before his death, he and his wife, Donna, were members of Fenton First United Methodist Church. Phil served as president of his church golf league and served for 10 years as a member of his condominium association's advisory committee.^[1] He finally retired in 1994.^[1]