Samuel (George) Ernest Cash, AM (born 12 September 1946 in Subiaco, Western Australia) is a former Australian politician, who represented the Liberal Party.
Elected to parliament in the 1989 state election, he was a member of the Western Australian Legislative Council representing the North Metropolitan Region.
He was awarded a Bachelor of Laws and later a Master of Laws at the University of Western Australia, later completing a Bachelor of Business. He worked as a business proprietor and a company director before entering parliament.
In 1984, Cash was elected to the Western Australian Legislative Assembly as the member for Mount Lawley following a by-election called after then premier Ray O'Connor resigned from parliament. He was re-elected in 1986 but the seat was then abolished in a redistribution in 1988.
Cash then switched to the Western Australian Legislative Council and was elected in the 1989 state election under the new proportional system in effect for the council. He served 20 years in that chamber, including four years as president (1997–2001) and several years thereafter as deputy president. He announced his retirement before the 2008 election and his term ended on 21 May 2009.