Original New Balance voetbalshirt Celtic 2017/18

The 2017–18 season was the 129th season of competitive football by Celtic. They competed in the Scottish Premiership, League Cup, Scottish Cup, Champions League and Europa League. Celtic won all three domestic tournaments, completing a double treble.

The Scottish Premiership fixture list was announced on 23 June 2017. Celtic began the defence of their title with a 4–1 victory against Heart of Midlothian at Celtic Park. On 4 November, Celtic broke their own British record for the number of games without defeat in all domestic competitions, a record set by Willie Maley's team that stood for 100 years. However, the unbeaten run ended at 69 games, following a 4–0 defeat to Heart of Midlothian at Tynecastle Park on 17 December. On 29 April 2018, Celtic won their seventh consecutive title and 49th overall after a 5–0 win against Rangers.