Acht may refer to:
Legal history German-language term for outlawry Imperial ban in the Holy Roman Empire
People René Acht (1920 – 1998), Swiss painter and graphic artist
Places Acht, Rhineland-Palatinate, Germany Acht, village within the municipality of Eindhoven, Netherlands Hohe Acht, a mountain peak in the Eifel range, Germany African-Canadian Heritage Tour, a designated trail in Ontario, Canada
Other uses Acht, German and Dutch for "eight"; see 8 (number) Acht (TV channel), a Flemish television channel "Acht-acht", informal name for the German 8.8 cm Flak 18/36/37/41 gun