Vakpatiraja I (reigned c. 917–944 CE), also known as Vappayaraja, was an Indian king belonging to the Shakambhari Chahamana dynasty.
He appears to have made an attempt to throw off the Gurjara-Pratihara overlordship, and was the first Chahamana king to assume the title Maharaja.
Vakpati was the son and successor of the Chahamana king Chandanaraja (alias Guvaka II) and queen Rudrani.
This may be an exaggeration, but it is possible that Vakpati participated in a large number of battles in the chaotic conditions resulting from Pratihara-Rashtrakuta conflict.
The Harsha inscription states that a tantrapala (provincial governor) attacked the Ananta region in the Chahamana territory.