Onrusrivier, or Onrus, is a settlement in Overberg District Municipality in the Western Cape province of South Africa.

The name Onrus means "restlessness", referring to the pounding of the surf on the rocky coast.

Onrusrivier has a popular beach and also a quaint tidal rock pool.

There is an abundance of birds in Onrus, as well as animals such as mongoose and porcupine.

The flora in Onrusrivier includes the ancient milkwood trees, and colourful indigenous flowers, which are seen only at certain times of the year.