National MP Maurice Williamson has announced he will not be standing in the Auckland Mayoralty race.

"Following approaches from many groups and individuals I agreed to consider standing. But after much thought and in-depth analysis, including looking at personal, political, funding and other circumstances, I have decided not to contest the Mayoralty.

"I want to thank the huge number of people who gave me their support and I am sorry if they're disappointed by my decision," the cabinet minister said in a statement issued today.

Williamson, who is minister of building and construction, customs, land information and statistics, said he is focused on serving his Pakuranga constituents and fulfilling his ministerial responsibilities.