| Marine Science Magnet High School of Southeastern Connecticut | |
| Address: | 130 Shennecossett Road |
| City: | Groton |
| State: | Connecticut |
| Zipcode: | 06340 |
| Country: | United States |
| Coordinates: | 41.3375°N -72.0716°W |
| Ceeb: | 070252 |
| Type: | Public high school |
| Principal: | Tara Amatrudo |
| Students: | 272 |
| Grades: | 9-12 |
| District: | LEARN |
| Mascot: | Sharks |
| Colors: | Red, white, and blue |
| Newspaper: | Atlantis/Fish Tails |
Marine Science Magnet High School of Southeastern Connecticut was the first public high school in Groton, Connecticut, in the United States. It opened on September 1, 2011.
In the academic year 2012–2013 there were 178 students enrolled in grades 9–11, of which 94 were male and 84 female. Approximately 93% were ethnically white, and 7% Hispanic.
In 2023 the school earned the National Blue Ribbon Award[1] and was ranked #1 in Connecticut by U.S. News & World Report.[2]