John P. Miller may refer to:

• John P. Miller (naval officer) (fl. 1920s), United States Navy officer and acting Naval Governor of Guam
• John Paul Miller (1918–2013), American jewellery designer and goldsmith
• John P. Miller (born 1976), birthname of actor and singer Austin Miller
• John P. Miller (educator) (fl. 1960s–2000s), Canadian educator