Sangrey is a census-designated place (CDP) in Hill County, Montana, United States.

Sangrey is located in southeastern Hill County within the Rocky Boy Indian Reservation.

According to the United States Census Bureau, the Sangrey CDP has a total area of 6.3 square miles (16.4 km2), all land.

The racial makeup of the CDP was 0.76% White, 95.82% Native American, 0.38% Asian, and 3.04% from two or more races.

About 54.0% of families and 57.3% of the population were below the poverty line, including 70.2% of those under the age of eighteen and 33.3% of those 65 or over.