Bahá'í Holy Days are a set of nine observances in the Bahá'í calendar commemorating monumental events in the faith's history, such as the births and declarations of its founders, The Báb and Bahá'u'lláh.

The Bahá'í New Year, known as Naw-Rúz, is celebrated on March 21st at the vernal equinox, marking the end of a 19-day fast with joyous festivities, community gatherings, and spiritual reflection.

The Day of the Covenant, observed on November 26th, honors the relationship between Bahá'ís and `Abdu'l-Bahá, reflecting on his leadership and commitment to the covenant of his father, Bahá'u'lláh.

Observed on May 29th, the Ascension of Bahá'u'lláh is a solemn day commemorating the passing of the faith's founder, with prayers and readings held at dawn, the exact time of His passing.

On most Bahá'í Holy Days, work is suspended as believers focus on prayer, reflection, and community. Exceptions include the Day of the Covenant and the Ascension of 'Abdu'l-Bahá, where it is not obligatory.

Bahá'í Holy Days are scheduled by the Bahá'í calendar, also known as the Badi' calendar, which consists of 19 months of 19 days, with Holy Days fixed within this framework, honoring significant historical events.

The Intercalary Days, or Ayyám-i-Há, are four or five days (depending on the year) devoted to charity, gift-giving, and socializing, serving as a time for Bahá'ís to focus on God's generosity and prepare for the coming fast.

The Twin Holy Birthdays celebrate the successive births of the Báb and Bahá'u'lláh with gatherings for prayers, stories of their lives, and community festivities, highlighting the inseparable connection between the two prophets.