John Barrett III (born 1947) is an American politician serving as a Democratic member of the Massachusetts House of Representatives.

[1] He was elected to the post on November 7, 2017, filling the vacant seat previously held by Gailanne Cariddi, who had died of cancer in June 2017.

[4] In his 2009 bid for a fourteenth term, he was defeated by council member Dick Alcombright.

He won a term on the city council in 2011, then lost to Alcombright in another run for mayor in 2015.

[5] He attended North Adams State College, now known as Massachusetts College of Liberal Arts (MCLA), where he received bachelor's and master's degrees as well as an honorary doctor of public service degree and the distinguished alumni award, and in 2016 he was named to MCLA's board of trustees.