Peter Murphy (born July 15, 1949) is an American politician and member of the Democratic Party who previously represented district 28 in the Maryland House of Delegates.

He began his non-political career as a microbiologist for the National Institutes of Health.

He later directed a large educational testing program at George Washington University.

[9] He was one of eight openly LGBT members of the Maryland General Assembly, alongside Sen. Rich Madaleno (D–Kensington) and Dels.

Anne Kaiser (D–Burtonsville), Heather Mizeur (D–Takoma Park), Maggie McIntosh (D–Baltimore), Mary L. Washington (D–Baltimore), Bonnie Cullison (D–Silver Spring) and Luke Clippinger (D–Baltimore).