John Spencer Boscawen (born c.1957) is an ACT New Zealand member of the New Zealand House of Representatives and as of May 2011, ACT's Parliamentary Leader and former Minister of Consumer Affairs of New Zealand. He came to parliament in the 2008 general election as a list MP, having been ranked fourth. Before entering parliament he was best known for his campaign against the Electoral Finance Act. He sat on the Finance and Expenditure, Commerce, and Parliamentary Service select committees, and is ACT's spokesperson for a range of issues including Housing, Transport, Energy and Economic Development.
In January 2013 he became the president of the ACT Party.