Adar (Hebrew: אֲדָר‎, ʾĂdār; from Akkadian adaru) is the sixth month of the civil year and the twelfth month of the religious year on the Hebrew calendar, roughly corresponding to the month of March in the Gregorian calendar.

The month's name, like all the others from the Hebrew calendar, was adopted during the Babylonian captivity.

In the Babylonian calendar the name was Araḫ Addaru or Adār ('Month of Adar').

[1] During the Second Temple period, there was a Jewish custom to make a public proclamation on the first day of the lunar month Adar, reminding the people that they are to prepare their annual monetary offering to the Temple treasury, known as the half-Shekel.

[2] Based on a line in the Mishnah declaring that Purim must be celebrated in Adar II in a leap year (Megillah 1:4), Adar I is considered the "extra" month.