The Tomb of the Unknown Soldier (Greek: Μνημείο του Αγνώστου Στρατιώτη, romanized: Mnimío tou Agnóstou Stratióti) is a war memorial located in Syntagma Square in Athens, in front of the Old Royal Palace.

In his capacity as Army Minister, an advertisement was placed in the Espera newspaper, requesting a "submission for a study of the construction of a tomb of the Unknown Soldier, in front of the Old Royal Palace, suitable for this purpose".

However in 1929, after fervent reaction and continuous meetings, Eleftherios Venizelos, setting aside his disagreements with Pangalos, decided that the best location would be the original one in Syntagma Square, reasoning that the Monument ought to be in the city centre, much like the Arc de Triomphe in Paris.

Initially, he had worked with sculptor Thomas Thomopoulos who had proposed as a central sculpture a representation of the Gigantomachy with an angel (representing Greece) lovingly receiving the dead soldier.

To the left, "ΜΙΑ ΚΛΙΝΗ ΚΕΝΗ ΦΕΡΕΤΑΙ ΕΣΤΡΩΜΕΝΗ ΤΩΝ ΑΦΑΝΩΝ" ("There's one empty bier made up for the unidentified [fallen] ones"); to the right, "ΑΝΔΡΩΝ ΕΠΙΦΑΝΩΝ ΠΑΣΑ ΓΗ ΤΑΦΟΣ" ("The whole earth is the sepulchre of famous men").

To the left of the monument, descending by the steps, are inscribed the names of battle locations of the First and Second Balkan War and World War I: Elassona, Sarantaporo, Lazarades, Porta Pass, Katerini, Sorovich, Yenidje, Thessaloniki, Ostrovon and Korytsa, Pesta, Gribovo, Pente Pigadia, Preveza, Aetorrachi, Manoliassa, Bizani, Driskos, Kilkis–Lachanas, Belles, Kresna-Tsoumagia, Petsovo, Nevrokopi, Banitsa, Machomea, Golobilo, Sborsko, Preslap, Erigon, Ravine, Monastiri, Skra, Strymon, Doiran, Belles, Grankorone and Tzena.

To the left and right of the figure of the dead soldier are the names of battle locations of World War II and later engagements in which Greeks died: Pindus, Morova, Korytsa, Kalamas, Tomoros, Trebeshina, Cheimarra, Argyrokastron, (Hill) 731, Boubesi, Kalpaki, Kleisoura, Premeti, Ostrovitsa, Pogradec, Roupel, Perithori, Crete, El Alamein, Rimini, Roubikonas, Dodecanese, Korea, Cyprus, Aegean and Ionion.