Florina (Greek: Περιφερειακή Ενότητα Φλώρινας, Perifereiakí Enótita Flórinas) is one of the regional units of Greece.

Florina borders the regional units of Pella to the east, Kozani to the south and Kastoriá to the southwest.

These are (number as in the map in the infobox):[2] Florina was created as a prefecture (Greek: Νομός Φλώρινας, Nomós Flórinas) in 1915.

[2] The demographic composition of the area the 19th and early 20th centuries is unclear as many factors contributed to the ethnic orientation of the people; out of these religion was particularly important thus giving rise to a proselytism struggle between the Greek Ecumenical Patriarchate of Constantinople and the Bulgarian Exarchate (established in 1870).

In 1886, 78.4% of the Christian population of the Florina kaza (district) - a part of Manastir Vilayet (province) - was aligned with the Ecumenical Patriarchate and 21.6% with the Bulgarian Exarchate, however by 1900 the Patriarchatists had dropped to 50.9% and Exarchatists had risen to 49.1%.

[5] In 1925, according to the Prefect of Florina 52% of the population were schismatics (up from about 20% in 1886), 25% were Patriarchists, 15% were refugees, 6% were Vlachs (Aromanians) and 3% were indigenous Greeks.

A diverse range of dialects are spoken in the regional unit alongside the official standard and local Macedonian varieties of Greek.