Hartford 21, Postmodern skyscraper in Downtown Hartford, Connecticut, US.

Hartford 21 is a 36-story, 134 m (440 ft) skyscraper at 211 Trumbull Street in downtown Hartford, Connecticut. Designed by Childs Bertman Tseckares Inc. and built by Turner Construction, it has 36 floors above ground and three below, containing 262 apartments plus lower-level retail and office space.

Construction began in June 2004 and was completed in 2006 by Turner Construction, at a cost of nearly $200 million, of which $32.5 million came from a state grant. The tower was designed by the Boston firm Childs Bertman Tseckares Inc. and stands at 211 Trumbull Street, beside the PeoplesBank Arena.

The building brought residential living back to the downtown core, reshaping how people use the commercial district. It reflects a shift toward mixed-use spaces where shopping, working, and living happen in close proximity.

Hartford 21 stands at 211 Trumbull Street, next to the PeoplesBank Arena near the Asylum Street intersection. The building has three below-ground levels; its lower level holds retail and office space. The 36 floors above ground are given over to 262 apartments.

Hartford 21 is described as the tallest residential tower between New York City and Boston. It is also the tallest building constructed in Hartford in the 21st century, and the fourth tallest in the city, fifth in Connecticut.