Michael Joseph "Mike" Harrington (born September 2, 1936) is an American politician, lawyer and a former U.S. Representative from Massachusetts.

On September 30, 1969, he won a special election to fill the vacancy caused by the death of U.S. Representative William H. Bates.

On July 8, 1975, Rep. Harrington called on House Speaker Carl Albert to convene the Democratic party committee to examine a secrecy system which he said has covered up "grotesque violations of the law" abroad by the CIA.

At a news conference the Massachusetts Democrat also released three other letters countering efforts in the House to censure him for his role in surfacing the disclosure in 1974 that the CIA spent 11 million dollars (1974 dollars not inflation adjusted) to influence Chilean politics.

After a brief run for the Democratic nomination for Massachusetts State Treasurer in 1990,[5] Harrington was charged in 2000 for making false statements to financial institutions, banks, and the Federal Deposit Insurance Corporation.