Moshe Aba Blass (born 1896, Łomża, Poland - 1971, Tel-Aviv, Israel) was a Polish-Israeli chess master.
Born in Łomża (then Russian Empire), he moved to the US, staying from 1911 to 1924.
In 1926, he tied for 8-9th with Mieczysław Chwojnik at the 1st Polish Chess Championship in Warsaw.
Blass played for Poland on the reserve board (+4 –3 =5) in the 2nd Chess Olympiad at The Hague 1928.
[1] He, along with other members of the Warsaw team (Rafał Feinmesser, Frydman, Stanisław Kohn, Leon Kremer, Karol Piltz and Henryk Pogorieły), won the gold medal in the 1st Polish Team Championship at Królewska Huta (Königshütte) 1929; took 2nd, behind Kremer, at Warsaw 1929 and took 8th at Warsaw 1930 (P. Frydman won).