| 1979 Transamerica Open | |
|---|---|
| Date | September 24–30 |
| Edition | 91st |
| Category | Grand Prix |
| Draw | 64S / 32D |
| Prize money | $175,000 |
| Surface | Carpet / indoor |
| Location | San Francisco, U.S. |
| Venue | Cow Palace |
| Champions | |
| Singles | |
 John McEnroe[1] | |
| Doubles | |
| Peter Fleming / John McEnroe[2] | |
The 1979 Transamerica Open, also known as the Pacific Coast Championships, was a men's tennis tournament played on indoor carpet courts at the Cow Palace in San Francisco, California in the United States. The event was part of the 1979 Colgate-Palmolive Grand Prix circuit. It was the 91st edition of the tournament and was held from September 24 through September 30, 1979. The singles event had a field of 64 players. First-seeded John McEnroe won his second consecutive singles title at the event.
- ^ "1979 San Francisco – Singles draw". Association of Tennis Professionals (ATP).
- ^ "1979 San Francisco – Doubles draw". Association of Tennis Professionals (ATP).