Henry Frank Hagemeister (November 18, 1855 – June 27, 1915) was an American brewer, banker, and politician from Green Bay, Wisconsin.

[1] Henry Hagemeister was born in Green Bay, Wisconsin, in 1855, and educated in the parochial and public schools of Green Bay.

Before being elected to the Assembly in 1892, Hagemeister was a member of the Green Bay city council and the Brown County board of supervisors, and was chairman of the county board while in the Assembly.

While in the Assembly, he was a member of the Democratic Party, but split with the party—like several other prominent Wisconsin Democrats—over the nomination of William Jennings Bryan and the party's turn toward populism.

[4] Running on the Republican ticket, he was elected to the Wisconsin Senate in 1900 and was re-elected in 1904, leaving office in 1909.