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This list of tallest buildings in Connecticut includes every building in the state of Connecticut that is at least 250 feet (76 meters) tall.
The tallest building in Connecticut is City Place I in Hartford which is 535 feet (163 meters) tall and has 38 stories.
| Rank | Name | Image | Height ft (m) | Floors | Year | City | Notes | Use |
|---|---|---|---|---|---|---|---|---|
| 1 | City Place I |  | 535 (163) | 38 | 1980 | Hartford | Tallest building in Hartford and Connecticut since 1980. Tallest building in Connecticut constructed in the 1980s. | Office |
| 2 | Travelers Tower |  | 528 (161) | 24 | 1919 | Hartford | Was the tallest building in the world outside of New York City upon completion. Tallest building in Connecticut constructed in the 1910s. | Office |
| 3 | Goodwin Square |  | 522 (159) | 30 | 1989 | Hartford | Office tower was built into the historic Goodwin Hotel. | Office |
| 4 | Mohegan Sun Sky Tower |  | 492 (150) | 36 | 2002 | Uncasville | Tallest building in Connecticut outside of Hartford | Hotel/Casino |
| 5 | Hartford 21 |  | 440 (130) | 36 | 2006 | Hartford | Built on the site of the former Civic Center Mall. Tallest building in Connecticut constructed in the 2000s. | Residential |
| 6= | Otis Elevator Test Tower |  | 383 (117) | 38 | 1986 | Bristol | Tallest building in Bristol. Owned by the Otis Elevator Company. | Industrial |
| 6= | Connecticut Financial Center |  | 383 (117) | 26 | 1990 | New Haven | Tallest building in New Haven. Tallest building in Connecticut constructed in the 1990s. | Office |
| 8 | 777 Main Street |  | 361 (110) | 26 | 1967 | Hartford | Until 2011, the Hartford office of Bank of America. Converted to residential use in 2015. Tallest building in Connecticut constructed in the 1960s. | Residential |
| 9 | Park Tower Stamford |  | 350 (110) | 34 | 2009 | Stamford | Tallest building in Stamford | Residential |
| 10 | 280 Trumbull Street |  | 348 (106) | 28 | 1984 | Hartford | Office | |
| 11 | 360 State Street |  | 338 (103) | 31 | 2010 | New Haven | Tallest building in Connecticut constructed in the 2010s. | Residential |
| 12 | One Financial Plaza |  | 335 (102) | 26 | 1975 | Hartford | Also known as the Gold Building. Tallest building in Connecticut constructed in the 1970s. | Office |
| 13 | Foxwoods |  | 325 (99) | 26 | 2007 | Ledyard | Hotel/Casino | |
| 14 | Knights of Columbus Building |  | 321 (98) | 23 | 1969 | New Haven | Office | |
| 15= | 2 Park Place |  | 309 (94) | 25 | Hartford | Twin tower of 24 Park Place | Residential | |
| 15= | 24 Park Place |  | 309 (94) | 25 | Hartford | Twin tower of 2 Park Place | Residential | |
| 17 | One State Street |  | 297 (91) | 24 | 1983 | Hartford | Office | |
| 18 | One Landmark Square |  | 295 (90) | 21 | 1973 | Stamford | Office | |
| 19 | Connecticut State Capitol |  | 287 (87) | 6 | 1878 | Hartford | Contains the office of the Governor of Connecticut and the Connecticut General Assembly. Tallest building in Connecticut constructed in the 19th century. | Government |
| 20 | One Corporate Center |  | 285 (87) | 23 | 1981 | Hartford | Office | |
| 21 | Cathedral of Saint Joseph |  | 284 (87) | 7 | 1962 | Hartford | Mother church of the Roman Catholic Archdiocese of Hartford. | Religious (Cathedral) |
| 22= | Atlantic Station Stamford | 282 (86) | 26 | 2018 | Stamford | Tallest building in Connecticut constructed in the 2020s. | Residential | |
| 22= | Atlantic Station West | 282 (86) | 26 | 2021 | Stamford | Tallest building in Connecticut constructed in the 2020s. | Residential | |
| 24 | Hilton Hartford |  | 281 (86) | 21 | 1975 | Hartford | Hotel | |
| 25= | Hartford Marriott Downtown |  | 272 (83) | 22 | 2005 | Hartford | Hotel | |
| 25= | Hartford Plaza | 272 (83) | 22 | 1967 | Hartford | Headquarters of The Hartford Financial Services Group. | Office | |
| 27 | Bushnell Tower |  | 263 (80) | 28 | 1969 | Hartford | Residential | |
| 28 | One Constitution Plaza |  | 257 (78) | 20 | 1963 | Hartford | Part of the Constitution Plaza complex. | Office |
| 29= | Summer House Apartments | 250 (76) | 22 | 2016 | Stamford | residential | ||
| 29= | Kline Biology Tower |  | 250 (76) | 16 | 1966 | New Haven | 46th-tallest educational building in the world. | Educational |
This lists buildings that are under construction, approved for construction or proposed for construction in Connecticut.
| Name | Height* ft (m) | Floors* | Year* (est.) | Status | Notes | |
|---|---|---|---|---|---|---|
| 677-707 Washington boulevard | 423 (129) | 34 | Approved | Will be the tallest building in Stamford | mixed use | |
| 3 Landmark Square | 320 (98) | 31 | Approved | Will be the second tallest building in Stamford | Residential |
* Table entries with dashes (—) indicate that information regarding building heights, floor counts, or dates of completion has not yet been released.
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