Adelbrik Adelen (Sexbierum, elected about 830) was the third potestaat (magistrate governor) of Friesland a province of the Netherlands.
He was potestaat during the government of Lorraine, and defeated the Vikings.
In Kollum he won a victory over a Swedish duke.
There is a source that indicates that he is a brother or a cousin of the Utrecht Bishop Frederik, who came from the same Friesian village of Sexbierum.
The family emblem of Adelen is a Friese eagle half left, and right on a blue field up with a key above.