Logo of Semafor theatre in former Alfa Passage, today Stýblova Passage, Prague
Semafor is a theatre in Prague, Czech Republic, established by Jiří Suchý and Ferdinand Havlík in 1959. It is one of the so-called "Theatres of small stages". Suchý has performed there for many years and is the current owner. The theatre was a starting point for many famous Czech musicians including Karel Gott and Hana Hegerová.
The name "Semafor" is an abbreviation for Sedm Malých Forem (Seven Small Forms), referring to forms of theater.