Ellington is a town in Tolland County, Connecticut, United States. Ellington was incorporated in May, 1786, from East Windsor. As of the 2010 census, the town population was 15,602.

Originally part of the Equivalent Lands and the town of Windsor, Ellington was part of the town of East Windsor from that town's incorporation in 1768 until Ellington split off twenty years later and incorporated itself in May 1786. Mostly known as an agricultural community, the Crystal Lake section of town was for a while a popular summer resort location. Ellington still has a significant amount of property dedicated to agriculture including cattle and corn farming.

Ellington's sole representative to the voting on the adoption of the United States Constitution by Connecticut was Ebenezer Nash. Nash was an anti-federalist and voted against the ratification, which passed 128-40.

Ellington is home to one of America’s oldest roadside memorials. A stone in the southwest corner of the town marks the site where Samuel Knight was killed "by a cartwheel rolling over his head in the 10th year of his age, Nov 8, 1812".

During the late 19th century and early 20th century, Ellington became the center of a community of Jewish immigrant farmers who were settled there by the philanthropist Baron Maurice de Hirsch's Jewish Colonization Association. They built a synagogue, Congregation Knesseth Israel, that is still standing and in use by an active Modern Orthodox congregation today and is on the National Register of Historic Places.

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