Robert Nance Cluck, Jr. (born March 20, 1939) is an American obstetrician-gynecologist and politician.

[2] Cluck is the vice president for medical affairs at Arlington Memorial Hospital, a position he has held since 2002.

Prior to that, he was the medical director at Arlington Memorial Hospital and Harris Methodist Health Plan.

Cluck then served in the United States Air Force from 1966 to 1968 and returned to medicine with an OB-GYN residency at Parkland Hospital.

Ryan Walker Grant tried to hire individuals from Mexico, through an intermediary from Mexico to kill Robert Cluck and Tom Brandt, a Dallas attorney who represents the city of Arlington in cases involving sexually oriented businesses.