A new underground lounge, My Girl, has officially opened in Boston, expanding the city’s nightlife landscape with a downtown location tied to a familiar space. The venue opened on Friday, December 5th, 2025, and is now operating at 10 Post Office Square.
My Girl occupies the former location of Mariel Underground, a spot previously known for nightlife programming beneath the downtown restaurant. The transition introduces a new concept while maintaining the underground setting associated with the space.
The lounge is open Tuesday through Saturday, beginning at 6 p.m. and operating late into the evening. While details around programming and offerings have yet to be formally outlined, the opening positions My Girl as a new option for after-work gatherings and late-night outings in the city’s business district.
With its central location and reuse of an established nightlife venue, My Girl enters Boston’s scene as a fresh addition rooted in a recognizable setting. The opening reflects the continued evolution of downtown Boston’s evening and late-night entertainment options.
