Focko Ukena (1360[1] or 1370 – 1435) was an East Frisian chieftain (hovetling) who played an important part in the struggle between the Vetkopers and Schieringers in the provinces of Groningen and Friesland.

Aside from this he was one of the leading figures in the resistance against the forts of stately authority in East-Frisia of the tom Brok family.

Ukena took Stavoren and besieged Sloten, but was forced to withdraw by the troops of John III, Duke of Bavaria, Count of Holland.

Ukena was unable to sustain his resistance to tom Brok, and eventually retreated to the castle of Dijkhuizen at Appingedam, which was the property of his second wife, Hiddeke Ripperda.

His resistance eventually prevented tom Brok from taking the much-wanted County of East Frisia.