Harry William Hays PC (25 December 1909 – 4 May 1982) was a Canadian politician, 27th Mayor of Calgary, Cabinet minister in the government of Lester B. Pearson, and Senator from Alberta.

In 1959 Hays would sell his dairy farm on the southern outskirts of the city to developers for $1 million, the land would eventually form the community of Haysboro.

Harry Hays resigned effective June 30, 1963, Grant MacEwan appointed as Mayor by Council and sworn on July 3, 1963.

During his time as Mayor, it was noted that Hays quickly gained the confidence of Council, city commissioners, the press and public, which made him an attractive candidate for Pearson's Liberals.

In June 1962 Sykes and Hays would announce CPR led development into a two-block project east of the Palliser Hotel.

Morrison, and several prominent businessmen including Carl Nickle, James K. Gray, Harry Cohen, Jack Pierce, and Peter Rule.

On April 5, just three days prior to the federal election, Hays would announce an agreement with CPR for a "$35 Million Face-Lift for Calgary" which would result in "a rebuilt downtown within two decades."

Hays had little formal education and was popular for his down to earth manner of living and talking and often swore and used poor grammar and colourful expressions.

"[1] Hays also established the Western College of Veterinary Medicine in Saskatoon and was responsible for expanding crop insurance and introducing a national farm accounting system.

Hays was defeated in his attempt to retain his seat in the 1965 federal election by Progressive Conservative candidate and two-term Calgary Aldermen Ray Ballard by a margin of 115 votes.