Collinsville is a town in Grayson County, Texas, United States.

US 377 passes through the west side of the town, leading north 7 miles (11 km) to Whitesboro and south 12 miles (19 km) to Pilot Point.

Sherman, the Grayson County seat, is 22 miles (35 km) to the northeast.

According to the United States Census Bureau, Collinsville has a total area of 0.93 square miles (2.4 km2), all land.

[4] As of the 2020 United States census, there were 1,866 people, 661 households, and 479 families residing in the town.