Columbus is a Latinized version of the Italian surname "Colombo". It most commonly refers to: Christopher Columbus Columbus, Ohio, United States Columbus may also refer to:

Dalton James Patrick McGuinty, Jr., (born July 19, 1955) is a Canadian politician. He was the 24th Premier of Ontario, Canada, from 2003 to 2013. McGuinty is generally regarded as holding moderately center to left views on economic issues, with his first budget raising personal taxes and planning to eliminate the province's tax on the capital of corporations. He holds liberal views on social issues, supporting abortion rights and same-sex marriage. First elected to the premiership in 2003, with his reelection in 2007, McGuinty became the first Ontario Liberal to win two majority governments since Mitchell Hepburn nearly 70 years earlier. In 2011, he became the first Liberal premier to secure a third consecutive term since Sir Oliver Mowat, after his party was re-elected in that year's provincial election, albeit with a minority. On October 15, 2012, McGuinty announced that he would resign from his position as leader and premier of Ontario. Following an Ontario Liberal Party leadership convention Kathleen Wynne was sworn in as Premier on February 11, 2013. He resigned his seat in the Ontario legislature on June 12, 2013.