| Bob Grottkau | |
| Position: | Guard |
| Number: | 60, 64 |
| Birth Date: | 22 March 1937 |
| Birth Place: | San Rafael, California, U.S. |
| Death Date: | June 18, 2024 |
| Death Place: | Spokane, Washington, U.S. |
| Height Ft: | 6 |
| Height In: | 4 |
| Weight Lbs: | 228 |
| High School: | Oakland (CA) |
| College: | Oregon |
| Draftyear: | 1959 |
| Draftround: | 4 |
| Draftpick: | 46 |
| Pastteams: | |
| Highlights: | |
| Statlabel1: | Games played |
| Statvalue1: | 30 |
| Pfr: | GrotBo20 |
Robert Fred Grottkau (born March 22, 1937) is a former American football guard in the National Football League (NFL) for the Detroit Lions and Dallas Cowboys. He played college football at the University of Oregon.
Grottkau attended Oakland High School where he played as a fullback. He accepted a scholarship from the University of Oregon. As a sophomore, he was switched to offensive tackle. The next year, he was moved to guard out of necessity and became a two-year starter.
He was selected by the Detroit Lions in the fourth round (46th overall) of the 1959 NFL draft.[1] In 1960, he played only 5 games.
On August 21, 1961, he was traded along with rookie Houston Entwine to the Dallas Cowboys in exchange for offensive lineman John Gonzaga.[2]
In 1961, he was a reserve player. On July 31, 1962, he was waived after being unable to overcome a knee injury.
Grottkau was the offensive line coach at San Jose State University for two years.[3] In 1971, he was named the offensive coordinator and line coach for the University of Iowa.