Robert "Rob" Merrifield, PC, (born December 19, 1953) is a Canadian politician and diplomat. He is the former Member of Parliament for Yellowhead, and was the Minister of State for Transport from October 2008 to May 2011. In September 2014 he resigned as an Member of the Canadian House of Commons to accept an appointment from Alberta Premier Jim Prentice to be the province's envoy to the United States in Washington, D.C.