After the First World War he attended the Akademie für Musik und darstellende Kunst in Vienna.
In the 1950s he appeared in many films, mostly in smaller parts.
Robert Wiene gave him a few small parts in three of his movies. After that he held an engagement in Berlin.
After the war he worked at the Theater in der Josefstadt.
Walter Varndal was the son of a Hofrat (court councilor).
In 1920 he debuted on the stage in Aachen.
In the early 1930s he was back in Vienna where he worked at the Neuen Wiener Schauspielhaus and at the Wiener Werkel cabaret that was co-founded by him.
The last years of his life he lived in an artist's home in Baden near Vienna. There he died in 1993.
He worked for several years in the provinces before he returned to Vienna in the mid 1920s.