Sotirios Papagiannopoulos (Greek: Σωτήριος Παπαγιαννόπουλος; born 5 September 1990) is a Swedish professional footballer who plays as a centre-back for Allsvenskan club AIK.

He played for the club's U-19 team before making the switch to his first professional senior side in Väsby United.

He helped lead Ostersunds to promotion to the Swedish Allsvenskan, the nation's top-flight, for the first time in the club's history.

On 13 April 2017, Papagiannopoulos was a substitute in the 2016–17 Svenska Cupen final, where the goals from Samuel Mensah, Hosam Aiesh, Alhaji Gero and Saman Ghoddos powered the Jämtkraft Arena outfit to their first major silverware and a place in the Europa League play-offs for next season, as they triumphed against IFK Norrköping with 4–1.

The club reached the knockout stage of the 2017–18 UEFA Europa League tournament after finishing second in Group J, level on points with Athletic Bilbao and ahead of Zorya Luhansk and Hertha Berlin.

Papagiannopoulos has been ever-present in the team even managing to score away to Hertha in the group finale, where he was also named Man of the Match.

In January 2018, Papagiannopoulos despite the interest of Belgian club Standard Liège, he renewed his contract with Östersunds FK for another year.

[8] On 27 May 2018, Copenhagen have signed Swedish defender Sotirios Papagiannopoulos from Östersunds FK on a four-year deal for an undisclosed fee.

"Sotirios has all the skills to be a very strong central defender at FCK, and we are very happy with the signing," says manager Ståle Solbakken.

He is fast, physically strong and good with the ball, and he has international experience from club level and the Swedish national team."

[9] The Greek-Swedish defender will be Erik Berg's replacement in the Danish squad as he asked to leave the club to return to Sweden.