John McCoy

• John McCoy (musician), British bass guitarist
• John McCoy (Irish politician), Irish Progressive Democrats politician 1987–1989
• John B. McCoy, American businessman
• John Calvin McCoy, American businessman and pioneer
• John W. McCoy, American artist
• John McCoy (American politician), American Indian Washington State Senator
• John E. McCoy, United States National Guard general

Fictional characters

• Jack McCoy, fictional district attorney in the television drama ''Law & Order''