Police are looking for a Lower Hutt man who has not been seen by his family for three weeks.

Timothy Potangaroa, 37, known as Timmy, was reported missing on Friday by his family, who had not seen him since September 6, which was out of character, said Detective Sergeant James Patea.

Mr Potangaroa was described as being Maori, about 185cm tall, of medium build with long black hair, possibly tied up in a ponytail. He is known to normally wear shorts or trackpants, tee shirts and a hooded sweatshirt.

Bank account transactions show that Mr Potangaroa's ATM card was used in the Wellington area as recently as last Thursday.