Vaisakha (Hindi: बैसाख baisākh or वैशाख vaishākh) is a month of the Hindu calendar. In India's national civil calendar, Vaisakha is the second month of the year, beginning on 21 April and ending on 21 May.

In lunar religious calendars, Vaisakha may begin on either the new moon or the full moon around the same time of year, and is usually the second month of the year. The harvest festival of Baisakhi is celebrated in this month.

In solar religious calendars, as well as the national calendar of Nepal, Vaisaakh begins with the Sun's entry into Aries, and is usually the first month of the year.