Mordechai Frizis (Greek: Μαρδοχαίος Φριζής; 1 January 1893 – 5 December 1940) was a Hellenic Army officer, who fought in World War I, distinguished himself in World War II, and was killed on 5 December 1940, fighting against the Julia Division.

After studying law at Athens University, he enlisted in the Hellenic Army in 1916, and went to officer training school.

[1] Following his death in action, the King of Greece, its then leader, Ioannis Metaxas, and a national newspaper left tributes for the officer.

[2] A spokesman for King George II of Greece wrote to Frizis' family: "On the glorious death for his country of your beloved husband, the heroic Colonel Mordechai Frizis, His Majesty the king has instructed me to convey to you and your family his deepest condolences".

Ioannis Metaxas, then Prime Minister of Greece, wrote the following letter to Frizis' wife: "I learnt of the death on the field of honour of your husband, before you knew of it and I did not know how to inform you.