Woonona are inviting all former players, supporters and members to celebrate their 125th anniversary when the Sharks face rivals Bellambi on June 7.
The day will recognise past greats over their extensive history as well as life members who helped the club to survive since 1889.
Woonona is the second oldest club in Illawarra football behind Balgownie Rangers, who were established in 1883 and returned to the top grade last season.
Outside the Premier League, the Sharks also field women's and junior teams who will help celebrate the anniversary at Ocean Park.
The club welcomes all members of the community to attend.
The youth-grade game kicks off at 12.30pm, with the first-grade game at 2.30pm.