Arnstein Finstad (born 21 March 1978) is a Norwegian cross-country skier.
He made his World Cup debut in March 2002 in Oslo, and collected his first World Cup points with a 27th place in Stockholm in February 2004. One week later he finished 19th in Drammen. He has only competed in sprint events.
He represents the sports club Steinkjer SK, and lives in Steinkjer.