3rd Groyne is a kitesurfing spot located in Mandurah, south of Perth, in Western Australia. This spot takes its name from the third rock groyne along the beach, which creates varied sailing conditions.

The prevailing south to southwest winds blow side-shore. The rock groyne offers a more sheltered area on one side. The spot is suitable for intermediate riders. Summer thermal breezes are reliable in this region.

Mandurah offers many services. Parking is available. Watch out for the rock groyne and currents around it.