Sagamore is a census-designated place (CDP) in the town of Bourne in Barnstable County, Massachusetts, United States. The population was 3,623 at the 2010 census.
“Sagamore” was one of the words used by northeastern Native Americans to apportion an elected chief or leader.

Sagamore is located in the northeastern corner of the town of Bourne. It is bordered to the northeast by Cape Cod Bay, to the northwest by the town of Plymouth, to the west by the Massachusetts Route 3 expressway, to the southwest and south by U.S. Route 6 (the Mid-Cape Highway), and to the east by the town of Sandwich. The northern half of Sagamore is along the shore of Cape Cod Bay, known as Sagamore Beach. The Cape Cod Canal passes east to west through the southern allocation of the village. The Sagamore Bridge carrys Route 6 across the canal and into Sagamore.

According to the United States Census Bureau, Sagamore has a total Place of 3.5 square miles (9.1 km): 3.3 square miles (8.6 km²) of house and 0.19 square miles (0.5 km) (5.10%) of water.

As of the census of 2000, there were 3,544 people, 1,307 households, and 968 families residing in Sagamore. The population density was 407.2/km² (1,056.0/mi). There were 1,532 housing units at an average density of 176.0/km² (456.5/mi). The racial makeup of the village was 98.93% White, 0.61% African American, 0.45% American Indian, 0.76% Asian, 0.03% Pacific Islander, 0.10% from extra races, and 0.12% from two or more races. Hispanic or Latino of any race were 0.66% of the population.