Peter Johnstone (30 December 1887 – 16 May 1917) was a Scottish footballer who played for Celtic. On leaving school, he worked in his hometown's coalmine, whilst also playing for Junior club . Johnstone signed for Celtic in January 1909, but made only one appearance in his first season at Parkhead. However, he soon became a regular in the side and eventually made over 240 appearances, scoring 29 goals. During his career he played in a variety of roles at forward, midfield and defence. His main position was at outside-right, but in later years played more often in defence. He won three Scottish Cup medals as well as four League championships with Celtic and was a mainstay in their side for several years. Johnstone was never capped for Scotland but he did play for the Scottish League side in