Saidy Janko (born 22 October 1995) is a professional footballer who plays as a right-back for Swiss club BSC Young Boys.

[6] On 2 February 2015, transfer deadline day, Janko joined Championship club Bolton Wanderers on loan for the rest of the season, with Andy Kellett going in the opposite direction for the same period.

[9] He made his debut nine days later, coming on as a substitute for Gary Mackay-Steven 75 minutes into Celtic's 1–0 win over Real Sociedad in a pre-season friendly at St. Mirren Park.

[10] Janko made his competitive debut on 1 August, coming on as a second-half substitute during Celtic's 2–0 win over Ross County in the opening league match of the Scottish Premiership season.

[17] On 1 July 2019, Janko entered football in his native country for the first time in his career, being loaned to Young Boys for the Swiss Super League season.

[24] On 30 June 2023, Real Valladolid announced that Janko had joined Swiss side Young Boys, where he had previously played on loan while a Porto player, on a permanent basis.