Ohi Day (Greece, Cyprus and the Greek communities), a national day in Greece.

Ohi Day is celebrated throughout Greece, Cyprus and the Greek communities around the world on 28 October each year. Ohi Day commemorates the rejection by the Greek Prime Minister Ioannis Metaxas of the ultimatum made by Italian dictator Benito Mussolini on 28 October 1940 and the subsequent Hellenic counterattack against the invading Italian forces at the mountains of Pindus during the Greco-Italian War and Greek resistance during the Axis occupation.

Cyprus, officially the Republic of Cyprus, is an island country in the eastern Mediterranean Sea. Situated in West Asia, its cultural identity and geopolitical orientation are overwhelmingly Southeast European. Cyprus is the third largest and third most populous island in the Mediterranean, after Sicily and Sardinia. It is located southeast of Greece, south of Turkey, west of Syria and Lebanon, northwest of Palestine and Israel, and north of Egypt. Its capital and largest city is Nicosia. Cyprus hosts the British military bases Akrotiri and Dhekelia, whilst the northeast portion of the island is de facto governed by the self-declared Turkish Republic of Northern Cyprus, which is separated from the Republic of Cyprus by the United Nations Buffer Zone.

A national day is a day on which celebrations mark the statehood or nationhood of a state or its people. It may be the date of independence, of becoming a republic, of becoming a federation, or a significant date for a patron saint or a ruler.