Edmund Moster (24 August 1873 – 1942) was a Croatian Jewish[1] entrepreneur, industrialist, inventor and co-founder of the "Penkala-Moster Company" (now TOZ) in Zagreb.

His father was much respected tradesman and steam mill owner in Sveti Ivan Žabno.

In 1911, Moster and his brother Mavro collaborated with Slavoljub Eduard Penkala to open the "Penkala-Moster" pen and pencil company in Zagreb.

As a Jew, during World War II, Moster was deported and imprisoned at the Jasenovac concentration camp where he was killed in 1942.

[1][7] His brother Bernard was also killed during the Holocaust in 1942, at Rab concentration camp.