Route 120 is a state highway in Connecticut, running entirely in the town of Southington.

It serves as a more direct connection between the town center of Southington and the city of Meriden.

It heads in a northwest direction, crossing Misery Brook about 1.5 miles (2.4 km) later, passing by the St. Thomas Cemetery, then intersecting with Route 364 after another 1.5 miles (2.4 km).

The entire length of Route 120 is two lanes wide and is known as Meriden Avenue.

[1] Route 120 is classified as an urban major collector road and carries an average daily traffic volume of 8,900.