Sam Mahon (born July 1954) is an artist and author living in Waikari in North Canterbury in the South Island of New Zealand.

He is the son of Peter Mahon, a lawyer notable for the Mt Erebus disaster inquiry, and has written a book about his father.

In late October 2009, Mahon made a bust of Environment Minister Nick Smith out of dairy-cow dung in order to publicise the campaign to stop the Hurunui River from being dammed for irrigation.

[4] In March 2010, the National Government passed legislation that saw elected members of Environment Canterbury replaced with government-appointed commissioners.

The image was made into a game on his website where visitors could guess who killed the PM by watching video clips embedded on the page.