F. Joseph "Joe" Loeper (born December 23, 1944) is an American politician who represented the 26th senatorial district from 1979 through 2000 in the Pennsylvania State Senate. He resigned his seat in 2000 after pleading guilty to falsifying tax documents.

Loeper was born in Upper Darby, Pennsylvania, to F. Joseph and Isabel (Martin) Loeper. He attended West Chester University, where he was a member of the Alpha Phi Omega fraternity and received a Bachelor of Science degree in education in 1966. He was a teacher in the Lansdowne-Aldan school district (1966–1967) and the Upper Darby School District (1967–1968). He received a Master of Science degree from Temple University in 1970. In 1972, he became treasurer of the Upper Darby School Board.

Loeper served as Republican Leader from 1989 through 2000, and as Senate Majority Leader from 1989 through 1992 and again from 1994 through 2000.^[2]

In 2000 he pleaded guilty in federal court of falsifying tax-related documents to conceal more than $330,000 in income he received from a private consulting firm while serving in the Senate.^[3][4] He resigned his senate seat on December 31, 2000,^[2] and was later released from federal prison at Fort Dix, New Jersey, after serving six months.^[5]

He is currently working as a lobbyist through his lobbying firm Loeper and Associates representing the Pennsylvania Turnpike,^[6] Drexel University,^[7] and others.