Borussia Verein für Leibesübungen 1900 e. V. Mönchengladbach, commonly known as Borussia Mönchengladbach ([boˈʁʊsi̯aː mœnçn̩ˈɡlatbax] (listen)), Mönchengladbach ([̩mœnçn̩ˈɡlatbax] (listen)) or Gladbach ([̩ˈɡlatˌbax] (listen); abbreviated as Borussia MG, BMG), is a professional football club based in Mönchengladbach, North Rhine-Westphalia, Germany, that plays in the Bundesliga, the top flight of German football. The club has won five League titles, three DFB-Pokals, and two UEFA Europa League titles.

Borussia Mönchengladbach were founded in 1900, with its name derived from a Latinized form of Prussia, which was a popular name for German clubs in the former Kingdom of Prussia. The team joined the Bundesliga in 1965, and saw the majority of its success in the 1970s, where, under the guidance of Hennes Weisweiler and then Udo Lattek, they captured five league championships with Die Fohlen [diː ˈfoːlən] (The foals) team; a term coined as the squad were young with a fast, aggressive playing style. Mönchengladbach also won two UEFA Cup titles during this period and reached a European Cup final in 1977.

Since 2004, Borussia Mönchengladbach have played at Borussia-Park, having previously played at the Bökelbergstadion since 1919. Based on membership, Borussia Mönchengladbach is the fifth largest club in Germany with over 75,000 members in 2016, and 93,000 members as of 2021. The club's main rivals are 1. FC Köln, against whom they contest the Rheinland Derby. Their secondary rivals include Borussia Dortmund, Fortuna Düsseldorf, and Bayer Leverkusen.