Herman Loin Humphrey (March 14, 1830 – June 10, 1902) was an American attorney, judge, and Republican politician.

[2] At the 1876 Republican Convention in Wisconsin's 7th congressional district, Humphrey's name was placed in nomination against incumbent Congressman Jeremiah McLain Rusk.

[7] After ten ballots with none of the three capable of achieving a majority, Porter and Rusk withdrew, and Humphrey was unanimously nominated.

His bid for nomination for another term was defeated at the district convention by William T. Price, who was heavily favored by the Temperance faction.

He served one final term in government, representing St. Croix County in the Wisconsin State Assembly for the 1887–1888 session.