A cyclist has died in a crash with a car outside a high school in Sydney's east, police say.

The male cyclist was on an organised ride with the Dulwich Hill Bicycle Club when he was involved in a collision with a car on Fitzgerald Avenue in Maroubra just after 6.30am on Wednesday.

Paramedics tried to treat the critically injured rider, but he died at the scene.

The crash occurred near Fitzgerald Avenue's intersection with Walsh Avenue, outside the Champagnat Catholic College Pagewood.