| R. Foster Clark | |
| Coach Sport1: | Football |
| Coach Years2: | 1920–1921 |
| Coach Team2: | Louisiana Industrial/Tech |
| Coach Sport3: | Baseball |
| Coach Years4: | 1921–1922 |
| Coach Team4: | Louisiana Industrial/Tech |
| Overall Record: | 11–1 (football) 17–3–1 (baseball) |
| Championships: | Football 1 LIAA (1921) |
R. Foster Clark was an American football and baseball coach at Louisiana Tech University. Clark has the highest winning percentage of any football and baseball head coach in Louisiana Tech history. Clark's 1921 football season went undefeated and won the Louisiana Intercollegiate Athletic Association (LIAA) title.