Rockville is a census-designated place and a village of the town of Vernon in Tolland County, Connecticut, United States.

A prominent feature of the area is the Shenipsit Lake, or "The Snip" as it is currently affectionately called by the residents.

The Snip feeds the Hockanum River which cascades 254 feet over 1.5 miles (2.4 km).

In 1821, Colonel Francis McLean built the first textile mill in what is now Rockville in partnership with George and Allyn Kellogg and Ralph Talcott, next to a spot known as "the Rock" with capital of $16,000.

"The Rock" was a natural dam of solid stone that made a high falls on the Hockanum River.

The mill attracted people to this area and by 1836 the population grew to 440 consisting of 61 families including 89 children under the age of 10.

Mail service was brought once a day by stagecoach from Vernon Center, which was the post office and place for voting for the town.

In 1837, according to old records, "an amateurish notice was posted on the Rock Mill announcing a public meeting in the lecture room of the village to decide in a democratic way the most suitable name for the vicinity".

Simon Chapman, who ran a boarding house for mill workers, submitted the name "Rockville" as common expression understood by the surrounding areas was "Going to the Rock".

The surviving buildings grouped around Central Park are a continuing reminder of the wealth brought by the woolen industry and the town's aspirations to be a leading city in the state during the 19th century.

Buildings of architectural or historic interest in Rockville include: As of the census of 2010, there were 7,474 people, 3,292 households, and 1,681 families residing in the CDP.