Michael Hayes or Mike Hayes may refer to:

• Michael Hayes (politician) (1889–1976), Irish Fine Gael politician
• Michael D. Hayes (born 1951), American member of Michigan House of Representatives

• Michael Joseph Hayes (1894–1918), U.S. Army officer killed in World War 1
• J. Michael Hayes (fl. 1996), U.S. Marine Corps general

• Michael Angelo Hayes (1820–1877), Irish watercolourist who specialised in painting horses and military subjects
• Michael Hayes (wrestler) (born 1959), American wrestler
• Michael Hayes (mass shooter) (born 1964), North Carolina (USA) mass shooter whose case sparked controversy over the insanity defense
• Michael Hayes (TV series), an American TV series
• Mickie Most (Michael Peter Hayes, 1938–2003), English record producer
• Mike Hayes (businessman), English businessman
• Mike Hayes (fighter) (born 1980), American mixed martial artist
• Michael Hayes (director) (1929–2014), British TV director