Hans-Dieter "Hansi" Flick (German pronunciation: [ˈhanzi ˈflɪk]; born 24 February 1965) is a German professional football manager and former player who is the manager of La Liga club Barcelona. He is considered one of the best managers in the world.

Flick played for SV Sandhausen, Bayern Munich, and 1. FC Köln during his career as a footballer. He began his managerial career as player-manager of fourth-division club Victoria Bammental. In 2000, he became manager of fellow fourth-division side TSG 1899 Hoffenheim, leading the team to promotion to the Regionalliga Süd before leaving in 2005. From 2006 to 2014, Flick was the assistant coach of the German national team under Joachim Löw, contributing to their victory at the 2014 FIFA World Cup. He subsequently served as the sporting director of the German Football Association (DFB) from 2014 to 2017.

Having rejoined Bayern Munich as an assistant coach in 2019, Flick was made interim manager following the departure of Niko Kovač in November 2019. He was later appointed permanently, and won the UEFA Champions League that season, completing the club's second continental treble. In 2021, he also led the side to a FIFA Club World Cup and another Bundesliga title. Alongside Pep Guardiola, they are the only managers to achieve a sextuple with their team. He later replaced Löw in charge of the Germany national team in 2021, leading the team to qualification for the 2022 FIFA World Cup, before being dismissed in 2023. In 2024, he joined Spanish club Barcelona, winning the Supercopa de España, Copa del Rey and La Liga in his debut season.

During his playing career, he was a midfielder who played 104 matches for Bayern Munich and scored five goals between 1985 and 1990. At Bayern, he won four Bundesliga titles as well as one DFB-Pokal title, and played in the 1987 European Cup Final. He later played 44 matches for Köln before retiring from professional football in 1993 due to injuries. His last spell as a footballer was with Victoria Bammental from 1994 until 2000.

Flick never played for the Germany national football team, but he made two appearances for the Germany under-18 team, in the group stage of the 1983 UEFA European Under-18 Championship on 15 and 17 May 1983, in a 1–0 win over Sweden and in a 3–1 win over Bulgaria, respectively.

Flick's managerial career began in 1996 as a player-manager of Victoria Bammental, which was playing in the Oberliga Baden-Württemberg at that time. At the end of the 1997–98 season, the club was relegated to the Verbandsliga Baden, but he remained their coach for two more seasons.

In July 2000, Flick became a manager of the Oberliga Baden-Württemberg side TSG 1899 Hoffenheim, winning the league and gaining promotion to the Regionalliga Süd in his first season at the club. He also won North Baden Cup four times in a row, between 2002 and 2005. After four unsuccessful attempts to reach the 2. Bundesliga, he was released from duties on 19 November 2005. During his tenure at Hoffenheim, Flick graduated first in his class, alongside Thomas Doll, from the German Sport University Cologne, gaining his top coaching credentials in 2003.

Flick later worked briefly as an assistant of Giovanni Trapattoni and Lothar Matthäus and sporting coordinator at Red Bull Salzburg. He stated that his work under Trapattoni, one of the world's most renowned managers, taught him many things, especially on tactics and in developing relations with players, but also said that he disagreed with Trapattoni's defence-first approach.