Romsey's MP is Sandra Gidley of the Liberal Democrats, who contested the seat in a by-election in 2000 after the death of the Conservative Michael Colvin. She retained the seat in the 2001 General Election.
The town was also the home to Earl Mountbatten of Burma, whose tomb is located in Romsey Abbey, the local parish church. He was given his earldom in 1947, and was at the same time given the lesser title "Baron Romsey, of Romsey". When the Earl died, his titles passed to his elder daughter, Patricia, who is now the Countess Mountbatten of Burma. Her eldest son is now styled as "Lord Romsey", this being a courtesy title.