Count Otto Ottoson Vellingk (1649, Jama, Swedish Ingria - 1708) was a Swedish general during the Great Northern War.
He was born in 1649 to Otto Gotthardsson Vellingk and Christina Nilsdotter Mannersköld, and had a brother, Mauritz Wellingk. He was promoted to general in 1698.
He participated in key battles of Great Northern War including: the Battle of Narva in 1700, and the Crossing of Daugava near Riga in 1701. He participated in the Battle of Klissow on 9 July 1702. He was in the Battle of Punitz on 28 October 1704.
He was made a royal advisor in 1705, and ennobled as a count in 1706.