October is the tenth month of the year in the Gregorian Calendar and one of seven Gregorian months with a length of 31 days. In the northern hemisphere, October is commonly associated with the season of fall.

October begins in western tropical astrology with the sun in the sign of Libra and ends in the sign of Scorpio. Astronomically speaking, the sun actually begins in the constellation of Virgo and ends in the constellation of Libra.

In Latin, octo means "eight," reflecting the fact that October was the eighth month in the Roman calendar.