The 2017–18 Saudi Second Division was the 42nd season of the Saudi Second Division since its establishment in 1976. The season featured 13 teams from the 2016–17 campaign, three new teams relegated from the 2016–17 First Division: Al-Adalh, Al-Jeel and Wej, and four new teams promoted from the 2016–17 Third Division: Al-Kholood as champions, Al-Hejaz as runners-up, Al-Taqadom as third place and Al-Jubail as fourth place. The league began on 19 October 2017 and ended on 17 March 2018.