Oakville is a census-designated place (CDP) and neighborhood section of Watertown, in Litchfield County, Connecticut, United States. The population was 9,047 as of the 2010 census. It is the most populous community in Watertown, with higher than twice as many people as the center village of Watertown. The ZIP code for Oakville is 06779.

Oakville is in the southeast portion of Watertown. It is bordered to the northwest by the village of Watertown and to the south by the city of Waterbury. The Connecticut Route 8 freeway forms the eastern edge of Oakville, with access from a half-exit at Connecticut Route 262. Oakville is 3 miles (5 km) north of Interstate 84 in Waterbury and 2 miles (3 km) southeast of U.S. Route 6.

According to the United States Census Bureau, the Oakville CDP has a total area of 3.3 square miles (8.5 km), of which 0.04 square miles (0.1 km²), or 1.06%, are water. Steele Brook, a tributary of the Naugatuck River, flows through Oakville, with a dam in the center of town forming Pin Shop Pond.

As of the census of 2000, there were 8,618 people, 3,255 households, and 2,369 families residing in the CDP. The population density was 1,053.0/km² (2,726.7/mi). There were 3,358 housing units at an average density of 410.3/km² (1,062.5/mi). The racial makeup of the CDP was 95.72% White, 1.17% African American, 0.08% Native American, 1.13% Asian, 0.02% Pacific Islander, 0.64% from new races, and 1.24% from two or more races. Hispanic or Latino of any race were 2.82% of the population.