Ronja may refer to:

• Ronia, the Robber's Daughter (Ronja Rövardotter), a children's book by Astrid Lindgren

• Reasonable Optical Near Joint Access, an optical point-to-point Free Space Optics data link

• Ronja (given name), the name Ronja.

See also

• Ronya (disambiguation)

• Ronia (disambiguation)