Robert Joseph "Bob" Sullivan (August 15, 1923 – June 19, 1981) was a walk-on offensive half back and defensive back out of Holy Cross who played for the dominant 1948 San Francisco 49ers under head coach Buck Shaw.

[1] The team went 12–2, finishing 2nd in the AAFC West.

At 5'-10" and 190 pounds (86 kg), Sullivan rushed 33 times for 121 yards over 13 games and had 4 receptions for 58 yards.

Defensively, Sullivan had one interception for a six-yard return.

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