Gartnait son of Girom was a king of the Picts.
The Pictish Chronicle king lists have him ruling for six or seven years between Drest IV and Cailtram.
Cailtram is said to have been Gartnait's brother and three sons of Girom are successively listed as king, although Drest son of Girom is not explicitly stated to have been a brother of Gartnait and Cailtram.