Penny Webster is a former mayor of Rodney District and a councillor on the Auckland Council. As mayor of Rodney she headed one of the six main local government entities generally considered as making up the Auckland metropolitan area (Auckland City, Manukau City, Waitakere City, North Shore City, Papakura District, Rodney District), with her district being the northernmost entity. All of these entities were merged into the new Auckland Council in 2010. She was also a former New Zealand politician: an MP from 1999 to 2002, representing the ACT New Zealand party.
Before entering politics, Webster was a farmer, and headed the Auckland branch of the Federated Farmers organisation.
She was first elected to Parliament in the 1999 elections, becoming a list MP.
In the 2002 elections, however, she was ranked in thirteenth place, a low position for a sitting MP. Owen Jennings, another former farmer, was also ranked lowly, prompting some to suggest that ACT was not as interested in the rural vote as it might once have been.
ACT did not win sufficient votes for thirteen seats, and so Webster did not return to Parliament.
In 2007 Webster was elected Mayor of Rodney District. In December 2008 she was unanimously elected as the chair of the Auckland Mayoral Forum.