The skinny dips follow a recent court decision that upheld the right to be naked in public for innocent reasons.
Andre Pointon's conviction for offensive behaviour was overturned last week in The High Court in Tauranga after he was seen running naked along a forest track.
He hoped the decision will change attitudes in New Zealand.
"Hopefully this sets a precedent for people that use their discretion in the naturist world, to go out into the country and be naked," Pointon said.
Pointon joined the other 298 at Papamoa Beach on Sunday.
The current world record is held by Llangennith in Wales, where 413 skinny dippers took the plunge at the same time.
- nzherald.co.nz