Sagar (pronounced Saagar) is a Sanskrit word for 'Sea' and is a fairly common male first name in India.

Sagara was the name of a king who features in Hindu legend; see Ganga for a reference.

Sagar, also known as Saugor, is a city in Madhya Pradesh state of central India. Sagar District and Sagar Division are administrative units headquarterered at Sagar.

Sagar or Sagara, also known as Saggere, is a town in Shimoga District of Karnataka, India; see Sagara, India.

Sagar is a family name of Anglo-Saxon origin; see Sagar (Anglo-Saxon name)

Sagar is the name of an ancient alien world in the Filmation animated series, BlackStar.