Ryley Grantham (born January 7, 1988) is a Canadian professional ice hockey centre who is under contract to the Missouri Mavericks of the ECHL. He was selected by the Calgary Flames in the 6th round (168th overall) of the 2008 NHL Entry Draft. On September 20, 2014, Grantham agreed to a contract with the Missouri Mavericks. He was later invited to participate in AHL affiliate, the Chicago Wolves 2014 training camp on October 5, 2014, before returning to Missouri.