How many times did the Pittsburgh Steelers beat the Dallas Cowboys in the Super Bowl?

The Pittsburgh Steelers have played in eight Super Bowls and won six:

1. Super Bowl IX, January 12, 1975 - Won against Minnesota 16-6
2. Super Bowl X, January 18, 1976 - Won against Dallas 21-17
3. Super Bowl XIII, January 21, 1979 - Won against Dallas 35-31
4. Super Bowl XIV January 20, 1980 - Won against L.A. Rams 31-19
5. Super Bowl XXX, January 28, 1996 - Lost to Dallas 27-17
6. Super Bowl XL, February 5, 2006 - Won against Seattle 21-10
7. Super Bowl XLIII, February 1, 2009 - Won against Arizona 27-23
8. Super Bowl XLV, February 6, 2011 - Lost to Green Bay 31-25

The Dallas Cowboys have played in eight Super Bowls and won five:

1. Super Bowl V, January 17, 1971 - Lost to Baltimore 16-13
2. Super Bowl VI, January 16, 1972 - Won against Miami 24-3
3. Super Bowl X, January 18, 1976 - Lost to Pittsburgh 21-17
4. Super Bowl XII, January 15, 1978, Won against Denver 27-10
5. Super Bowl XIII, January 21, 1979 - Lost to Pittsburgh 35-31
6. Super Bowl XXVII, January 31, 1993 - Won against Buffalo 52-17
7. Super Bowl XXVIII, January 30, 1994 - Won against Buffalo 30-13
8. Super Bowl XXX, January 28, 1996 - Won against Pittsburgh 27-17

The two teams have faced each other in three Super Bowls: 1976 (X), 1979 (XIII), and in 1996 (XXX). Pittsburgh won the first two contests while Dallas won the third.