Titusville is a hamlet and census-designated place in the town of LaGrange, New York, in Dutchess County, United States.

[3][4] Titusville is in the southwestern part of the town of LaGrange, 5 miles (8 km) southeast of the city of Poughkeepsie.

It is bordered to the south by the hamlet of Red Oaks Mill.

According to the U.S. Census Bureau, the Titusville CDP has an area of 0.69 square miles (1.8 km2), all land.

[3] It is in the Arlington Central School District,[5] which operates Arlington High School.