Agnes of Brandenburg (c. 1257 – 29 September 1304) was a Danish Queen consort by marriage to King Eric V of Denmark.

As a widow, she served as the regent of Denmark for her son, King Eric VI, during his minority from 1286 until 1293.

The marriage was probably agreed upon during King Eric's captivity in Brandenburg by Agnes' father from 1261 to 1264.

Tradition claims that the King of Denmark was released from captivity on his promise to marry Agnes without a dowry.

In 1290, she financed a granted lime painting in St. Bendt's Church in Ringsted, which depicts her in a dominating way.