Alcibiades Diamandi or Alcibiadi Diamandi , Alcibiade Diamandi. or Alkiviadis Diamandi (in Greek: Αλκιβιάδης Διαμάντης) (sometimes spelled Diamanti or Diamantis) (Samarina, Greece, August 13, 1893 – Bucharest, July 9, 1948) was an Aromanian (Vlach) political figure of Greece, active during the First and Second World Wars in connection with the Italian occupation forces and Romania. By 1942 he fled to Romania and after the end of the Second World War he was sentenced by the Special Traitor's Courts in Greece to death. In Romania jailed by the new Communist government and he died there in 1948.
Diamandi was born in Samarina (at over 1,600 metres, the village situated at the highest altitude in Greece) to a family of wealthy Aromanian merchants. After attending the Romanian primary school in Samarina, he studied at the Greek Lyceum in Thessaloniki (at that time still part of the Ottoman Empire) and on the eve of the Balkan Wars in 1912 he left (as many other Vlachs of Greece) for Romania, where he enrolled at the Commercial Academy (Academia Comercială) in Bucharest, and graduated from it. As Romania entered World War I in 1916, Diamandi volunteered for military service, briefly serving as officer.
It is not clear whether he was discharged from the Romanian Army or rather dispatched by the Romanians to Albania where, under the Italian and French tutelage (see Birth of Albania), he was one of the supporters of the Vlachs from Pindus who asked from the Italians and the Romanians to support them in an autonomous canton under the protection of Italy. This attempt is called in later bibliography "Principality of the Pindus" and it received a clearly negative answer from the Romanians, as well as from the Italians who promptly withdrew from Pindos. After the withdrawal of the Italians, he became consul of Romania at Sarandë in Albania in 1926. From there he fled to Rome—where he became involved with Benito Mussolini's Fascist political movement. He contacted the Romanian Legation and was issued a Romanian passport, with which he was able to travel to Greece. According to the Greek author Stavros Anthemides, Diamandi was 'pardoned' by the Greek authorities in 1927 for his resistance to Greek authorities.