The Shellharbour City Sharks are a Country Rugby League club founded in 1920 located on the South Coast of NSW that compete in the South Coast Group 7 competition.

The Shellharbour LGA itself forms the southern part of the Greater Wollongong urban area.

In 2007, Shellharbour City struck a deal with NRL side the St. George Illawarra Dragons and thus created a new team and entered themselves into the NSWRL Jim Beam Cup with the name Shellharbour City Marlins using the colours as their parent club.

The Shellharbour Sharks still competed in Group 7 Rugby League competition during this time.

Ron Costello Oval (formally Fuller Park) has been the home of Shellharbour City Rugby League Football Club since the mid-1950s.