Ocko II tom Brok (1407–1435) was Chieftain of the Brokmerland and the Auricherland in East Frisia (initially under the guardianship of his grandmother, Foelke).

He was the last East Frisian chieftain from the tom Brok line.

Under his reign there was a revolt by the other Frisian chieftains against tom Brok.

Ocko married Ingeborg of Oldenburg, and therefore, supported by the counts, asked them for assistance.

On 28 October 1427, Ocko II was defeated at the Battle of the Wild Fields and fell into captivity.