Mikasa (Japanese: 三笠) refers to a number of different places, people, and things:
- Mount Mikasa, a mountain in Nara, Japan, also known as Mount Wakakusa
- Mikasa, Hokkaidō
- Japanese battleship Mikasa
- Mikasa Sports, a sporting goods manufacturer
- The Mikasa brand of tableware and food utensils marketed by Mikasa & Company, an American importer and distributor.
- The princely house of Mikasa-no-miya within the Imperial House of Japan
- Prince Mikasa (b. 1915)
- Princess Mikasa (b. 1923)
- Prince Tomohito of Mikasa (1946 - 2012)
- Princess Tomohito of Mikasa (b. 1955)