| Year: | 1973 |
| League: | NSWRFL |
| League Rank: | 2nd |
| Cup: | Challenge Cup |
| League Wins: | 19 |
| League Draws: | 0 |
| League Losses: | 7 |
| Points For: | 438 (87 tries, 88 goals, 1 field goal) |
| Points Against: | 254 (44 tries, 60 goals, 2 field goals) |
| Ceo Title: | CEO |
| Coach: | Tommy Bishop |
| Captain: | Tommy Bishop Greg Pierce Cliff Watson |
| Stadium: | Endeavour Field |
| Avg Attendance: | 8,237 |
| Top Tries: | Tommy Bishop (9) |
| Top Goals: | Steve Rogers (49) |
| Top Points: | Steve Rogers (119) |
| Prev Season: | 1972 |
| Next Season: | 1974 |
The 1973 Cronulla-Sutherland Sharks season was the seventh in the club's history. They competed in the New South Wales Rugby Football League's 1973 season.
Three Cronulla players, Ken Maddison, Greg Pierce and Steve Rogers were selected to make their international representative debuts for Australia in 1973.
| width=20 abbr="Position" | width=175 | Team | width=20 abbr="Played" | Pld | width=20 abbr="Won" | W | width=20 abbr="Drawn" | D | width=20 abbr="Lost" | L | width=20 abbr="Points for" | PF | width=20 abbr="Points against" | PA | width=20 abbr="Points difference" | PD | width=20 abbr="Points" | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Manly | 22 | 17 | 1 | 4 | 500 | 226 | +274 | 35 | ||||||||||
| 2 | Cronulla | 22 | 17 | 0 | 5 | 389 | 219 | +170 | 34 | ||||||||||
| 3 | St. George | 22 | 15 | 0 | 7 | 372 | 213 | +159 | 30 | ||||||||||
| 4 | Newtown Jets | 22 | 14 | 0 | 8 | 358 | 224 | +134 | 28 | ||||||||||
| 5 | Canterbury | 22 | 12 | 1 | 9 | 369 | 269 | +100 | 25 | ||||||||||
| 6 | Eastern Suburbs | 22 | 12 | 0 | 10 | 415 | 314 | +101 | 24 | ||||||||||
| 7 | South Sydney | 22 | 11 | 1 | 10 | 345 | 367 | -22 | 23 | ||||||||||
| 8 | North Sydney | 22 | 7 | 1 | 14 | 239 | 350 | -101 | 15 | ||||||||||
| 9 | Western Suburbs | 22 | 7 | 0 | 15 | 310 | 414 | -104 | 14 | ||||||||||
| 10 | Balmain | 22 | 7 | 0 | 15 | 254 | 495 | -241 | 14 | ||||||||||
| 11 | Parramatta | 22 | 6 | 0 | 16 | 275 | 492 | -217 | 12 | ||||||||||
| 12 | Penrith | 22 | 5 | 0 | 17 | 272 | 525 | -253 | 10 | ||||||||||