
April is the fourth month of the year in the Gregorian calendar, the fifth in the early Julian, the first of four months to have a length of 30 days, and the second of five months to have a length of less than 31 days.

The following events occurred in April 1900:

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The following events occurred in April 1981:
Aprilis or mensis Aprilis (April) was the fourth month of the ancient Roman calendar, following Martius (March) and preceding Maius (May). On the oldest Roman calendar that had begun with March, Aprilis was the second of ten months in the year. April had 30 days on calendars of the Roman Republic, with a day added to the month during the reform in the mid-40s BC that produced the Julian calendar.

Floréal was the eighth month in the French Republican Calendar. The month was named after the Latin word flos, which means flower.

Germinal was the seventh month in the French Republican Calendar. The month was named after the Latin word germen, "germination". Germinal was the first month of the spring quarter. It started March 21 or March 22, and ended April 19 or April 20. It follows Ventôse and precedes Floréal.