Usagi may refer to:

• Typhoon Usagi (disambiguation), one of several named tropical storms

Usagi, a Japanese unisex name/unisex given name, used by several fictional characters:

• Usagi Tsukino or Sailor Moon, the main character in Sailor Moon

• Usagi "Chibiusa" Tsukino or Chibiusa, a character in Sailor Moon

• Miyamoto Usagi, the main character in Usagi Yojimbo

• Kuro Usagi, or Black Rabbit, one of the main characters from Problem Children Are Coming from Another World, Aren't They? **Usagi Aloha'oe, a main protagonist of the ninth part of the JoJo's Bizarre Adventure series, The JoJoLands

• Usagi, a main character in Chiikawa