Delahunt, who has also been critical of spending on programs like Radio and TV Marti, told the Globe he'll announce his plans Friday.
"It's got nothing to do with politics," he told the Globe. "Life is about change. I think it's healthy. It's time."
He's the third major player on efforts to ease sanctions against Cuba to announce plans to retire: Democratic senators Chris Dodd and Byron Dorgan said in January they're leaving. On the other side of the ledger, Miami Republican Lincoln Diaz-Balart -- a staunch defender of the embargo -- said last month he plans to retire.