William Millar

• William Millar, former President of the American Public Transportation Association
• William Millar , British Royal Artillery officer
• William Millar , Irish-born Wisconsin politician
• Billy Millar , South African rugby union player
• Willie Millar, Scottish footballer
• Billy Millar, Irish international footballer
• Billy Millar , Scottish footballer
• William Millar, Irish-born American actor, known as Stephen Boyd
• Will Millar, Irish-Canadian singer