Margrit Rainer born as Margrit Rosa Sandmeier (9 February 1914 – 10 February 1982) was a Swiss comedian, radio personality, and stage and film actress starring usually in Swiss German language cinema and television and stage productions.
Born and raised in Zürich-Oerlikon, Canton of Zürich in Switzerland, to Elise née Boller and Johannes Rudolf,Margrit Rosa Sandmeier dreamed of a circus career. Her parents forced her to make an apprenticeshipt as a photo lab assistant, but she secretly took acting classes and singing lessons. At the age of 18, she married Fritz Pfister, a Swiss actor, and they emigrated to Ibiza, where they operated a chicken farm. But the marriage broke up and she returned to Switzerland. Rainer worked as a cashier at the Zürich hotel Hirschen in 1934, the venue of the Cabaret Cornichon.
After first appearances at the Schweizerisches Volkstheater in 1938, Rainer debuted as chinesische Mutter ("Chinese mother") at the Cabaret Cornichon. Engagements at the Corso Theater Zürich and on occasion of the Swiss National Exhibition Landi'39 at Zürichhorn as Mäiti in the Swiss-German play "Steibruch", brought her artistic breakthrough. In the meanwhile, she also staged on the cabarets Resslirytti in Basel and Nebelhorn in Zürich, but from 1938 to 1950 she was a member of the Cornichon ensemble in Zürich where she met Ruedi Walter. She also played in various radio plays, among others in Regenpfeifer by Jürg Amstein and Artur Beul in 1948.