Bondi Rescue lifeguard Terry McDermott, who died on Thursday, has been remembered as a "selfless man" who saved countless lives.

Mr McDermott's death was announced on the Bondi Rescue Lifeguards Facebook page late on Friday night.

He was a lifeguard for more than 30 years and starred on the reality TV show Bondi Rescue between 2009 and 2013.

Mr McDermott was diagnosed with prostate cancer in 2020. "The lifeguard world is mourning the loss of one of [the] nicest watermen to don a jersey," the post read.

"This selfless man saved countless lives during his career spanning more than 30 years working at many different beaches.

"Terry, Tezzy, T-Mac, Moondoggy McDermott .... Thank you for your service to the community. "Rest easy great man."