Police fear for the safety of a mountain bike rider who was last seen riding in a regional park north of Wellington on Thursday.

Lance Kaiki, 43, was last seen about 2.30pm in the Belmont Regional Park, 7km north of Lower Hutt, a police statement says.

Searchers have already scoured the area but failed to find any trace of Mr Kaiki who has not used his bank accounts or cell phone since he was last seen.

He is described as 170cm tall, of medium build and with dark coloured hair. He was wearing a green long-sleeved top, blue jeans, white sports shoes and carried a blue backpack.