Count Magnus Gustafsson Stenbock (22 May 1665 – 23 February 1717) was a Swedish military officer at the time of the Great Northern War.
He was born in , the son of Gustaf Otto Stenbock and Christina Catharine de la Gardie.
He was educated at Uppsala and at Paris, chose the military profession, and spent some years in the service of the United Provinces.
Returning to Sweden he entered the Army, and, in 1688, became major. He served with the Swedes in the Low Countries and on the Rhine, distinguishing himself for skill and courage at Fleurus. During the Nine Years' War he was employed not only in the field but also as a confidential agent in diplomatic missions.
He married Eva Magdalena Oxenstierna on 26 December 1690 in Stockholm. She was the daughter of Bengt Gabrielsson Oxenstierna and Magdalena Eriksdotter Stenbock.
Soon afterwards, as colonel of the Dalecarlian regiment, he led it in the astonishing victory of Narva. He distinguished himself still more at Dünamünde, Klissow and Cracow. In 1703 he fought the successful battle at Pułtusk, and three years later, having reached the rank of general of infantry, was made Governor-General of Scania. He led the Swedish troops to victory in the Battle of Helsingborg (1710), the last battle between Denmark and Sweden in Scania.