Nicolaos Matussis, Nicolae Matussi (Greek: Νικόλαος Ματούσης; 1898 – after 1981) was a Greek Aromanian lawyer, politician and leader of the Vlach "Roman Legion", an Italian-sponsored political and Aromanian paramilitary during World War II in Central Greece.
Nicolaos Matussis was born in Samarina in the Pindus mountains. He was a devoted Aromanian nationalist and from 1923 he was the general secretary of the Communist Party in Trikala. However in 1926 he was excluded by the party. Then he went to Larissa where he was active in Yannis Sofianopoulou's Rural Party. He practised law in Larissa before joining the Roman Legion that his compatriot, Alcibiades Diamandi, formed upon the onset of the Axis Occupation of Greece. In 1941 he was second in command of the so-called Roman Legion, an Italian-sponsored organization which assisted the Italian occupation forces, which Diamandi used in order to promote aromanian autonomy (and if allowed, a secessionist state - the Principality of the Pindus or "State of Pindus" or "Canton of Pindus") in north-western and central Greece. In 1942, after Diamandi suddenly left Greece to go to Romania, Matussi became leader of the so-called Roman Legion. Then, when the Legion collapsed since their Italian supporters left and were replaced by the Germans and the Greek resistance grew more active, he went to Athens, but he was obliged to flee to Romania like Diamandi the next year.
In 1964, following his requests and also the request of the Greek government, he was released to the hands of Greek authorities, who put him to prison and took him to court, accused of treason (like several members of the "Roman Legion" in the courts just after the war in 1945–1947). In this court (which took place in Athens, far from Larissa where he was active) and with the support of defence witnesses he was declared innocent of war crimes. In 1976 his civil rights were completely restored by a Greek court. Up to his death, in 1981, he lived in Athens.
He was married in 1920 with Sofia Balodimou (-1984). They had together a daughter Xeni (Polyxeni), painter (1927 – 28 September 1985).
- Adina Berciu-Drăghicescu, Maria Petre, Şcoli şi biserici româneşti din Peninsula Balcanică, Documente (1918–1953), Editura Universităţii din Bucureşti, 2006, Volumul II, ISBN 9789737371867 
- Τα παιδιά της λύκαινας. Οι "επίγονοι" της 5ης Ρωμαϊκής Λεγεώνας κατά τη διάρκεια της Κατοχής (1941–1944), (The children of the she-wolf, the descendants of the 5th Roman Legion during the period of the Occupation of Greece) (1941-1944), Σταύρος Παπαγιάννης (Stavros Papayiannis), Εκδόσεις Σοκόλη. ISBN 978-960-7210-71-5, 1999, 2004, pp. 28, 47 and 444: In official documents of Feb 1942, the Ampelonas Community Records, Matussi is mentioned as Πρόεδρος της Ρωμαϊκής Λεγεώνος (President of the Roman Legion)
- Η ρουμάνικη προπαγάνδα (The Romanian Propaganda), www.almyros.vlahoi.net, Digital version of the book: ΒΛΑΧΟΙ, ΙΣΤΟΡΙΑ - ΠΟΛΙΤΙΣΜΟΣ - ΕΘΙΜΑ ΠΡΟΣΩΠΙΚΟΤΗΤΕΣ, ΣΥΛΛΟΓΟΣ ΒΛΑΧΩΝ ΕΠΑΡΧΙΑΣ ΑΛΜΥΡΟΥ, επιμέλεια: Δημήτριος Γ. Τσούτσας, Αλμυρός 2006
- Παπαθεοδώρου, Νικόλαος Αθ. (2015-03-04). "Η οικογένεια Νικ. Ματούση". Ελευθερία (newspaper of Larissa). Retrieved 2015-08-16.