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Hagar (Bible), in the Book of Genesis, the handmaiden of Sarah and wife of Abraham.

Hagarism: The Making of the Islamic World, title name taken from the above lady.

Hagar, Ontario, a community in the Canadian province of Ontario

Hagar (company), an Icelandic retailer company, part of the Baugur Group.

Hägar the Horrible, the comic strip by Dik Browne.

Sammy Hagar, the rock musician.

Mandy Hagar, a New Zealand children's book author.

Albert Hagar, a Canadian politician.

Regan Hagar, a drummer in a band.