Robert Watson Joseph Ghiz, MLA (born January 21, 1974) is a Canadian politician who has been the 31st Premier of Prince Edward Island since 2007. He is the son of former Premier Joe Ghiz, and at age 38, he is the youngest of the current Canadian premiers.

Ghiz was born and raised in Charlottetown, Prince Edward Island, the son of Rose Ellen (McGowan) and Joe Ghiz. He served in the Canadian Forces Primary Reserves, while attending high school in the early 1990s. He attended Bishop's University where he earned a Bachelor's degree in political science; his father spoke at Ghiz's graduation.

Ghiz moved to Ottawa following his father's death from cancer, where he worked as a political aide for Deputy Prime Minister Sheila Copps before joining the Bank of Nova Scotia in 1998. In 2001 Ghiz joined the office of Prime Minister Jean Chrétien where he served as Atlantic Canada advisor before leaving to run for leader of the Prince Edward Island Liberal Party in 2003.

In 2003, Ghiz narrowly defeated former provincial Health Minister Alan Buchanan for the leadership of the party and went on to win a seat in the Legislative Assembly of Prince Edward Island in the 2003 provincial election. The MLA for Charlottetown-Rochford Square (now Charlottetown-Brighton) served as Leader of the Official Opposition in the provincial legislature from 2003-2007.