1905-06 was Celtic's 18th season of competitive football.
They competed as trophy holders in the Scottish First Division,[1] which they successfully retained.
It was the second time Celtic won two league titles in a row, their 6th league title overall, and their 10th major domestic title.
This was their second league title in route to a then record six league titles in a row.
Celtic reached the third round of the Scottish Cup, but lost 1-2 home to Hearts.They also won the Glasgow Cup this season.