How many Super Bowls did the 49ers win with Steve Young?

Two. Steve Young was a member of the San Francisco 49ers for three of their Super Bowl victories (SBs XXIII, XXIV, and XXIX). He did not play in Super Bowl XXIII, a 20-16 victory over the Cincinnati Bengals. He mopped up for Joe Montana in the 4th quarter of Super Bowl XXIV, a 55-10 victory over the Denver Broncos. He was the starting QB and MVP of Super Bowl XXIX, a 49-26 victory over the San Diego Chargers.