Ralf Dietrich Rangnick (German: [ʁalf ˈdiːtʁɪç ˈʁaŋnɪk]; born 29 June 1958) is a German professional football coach, executive, and former player who is currently the manager of the Austria national team.

Rangnick began his coaching career in 1983, succeeding his career as a player, at age 25. In 1997, he was hired by former club Ulm 1846, with whom he won the Regionalliga Süd in his debut season. Rangnick was then appointed by Bundesliga club VfB Stuttgart, winning the UEFA Intertoto Cup in 2000, but was dismissed in 2001. He subsequently joined Hannover 96, winning the 2. Bundesliga, but was dismissed in 2004. After a brief period with Schalke 04, Rangnick joined TSG Hoffenheim in 2006, and achieved successive promotions to the Bundesliga. He departed the club in 2011 and returned to Schalke 04, where he won the 2011 DFB-Pokal and reached the semi-finals of the UEFA Champions League. He later served as head coach at RB Leipzig across two periods between 2015 and 2019.

Rangnick joined Red Bull as director of football in 2012, helping oversee their expansion into European football, emphasising the recruitment of unproven players and developing youth systems with a worldwide scouting base and an attacking on-pitch philosophy across their clubs. As a result, Red Bull clubs rose in market value from €120 million to €1.2 billion during his tenure. Their clubs have also seen sustained domestic success and generated sizable profits with player transfers, which led to Rangnick's promotion to head of sport and development in 2019. He resigned from Red Bull in 2020 and joined Russian club Lokomotiv Moscow as manager of sports and development in 2021. Later that year, Rangnick was appointed as interim manager of Manchester United until the end of the 2021–22 season, following which he took charge of the Austria national team.

Rangnick is credited with developing the Gegenpressing tactic, whereby the team, after losing possession, immediately attempts to win back possession, rather than falling back to regroup. His sides have been noted for their pressing and high attacking output, as well as for popularising zonal marking. He is credited for influencing Thomas Tuchel, Julian Nagelsmann, Jürgen Klopp and Oliver Glasner, among others.

Ralf Dietrich Rangnick was born and raised in Backnang. His parents, Dietrich and Erika Rangnick, met in 1945 in Lichtenstein, Saxony, in the Ore Mountains. His mother is from Breslau (now Wrocław, Poland) and his father is from Königsberg (now Kaliningrad, Russia).

Rangnick began his playing career at VfB Stuttgart, but was noted for his strategic talents and was added as player-coach. His playing career was short-lived and was primarily concentrated in Germany, but included a stint at English club Southwick while studying at the University of Sussex.

Rangnick was one of the first coaches to publicise football tactics, notably during a ZDF SportsStudio TV broadcast in December 1998. As a result, Rangnick became known as the "professor"; a title initially used to jeer him, which then grew to be used to show respect.

Rangnick began his coaching career in the 1980s, first as player-coach at his hometown club Viktoria Backnang, then continuing on to play and coach at VfB Stuttgart II and TSV Lippoldsweiler.