The Hijri year (Arabic: سَنة هِجْريّة) or era (التقويم الهجري at-taqwīm al-hijrī) is the era used in the Islamic lunar calendar. It begins its count from the Islamic New Year in which Muhammad and his followers migrated from Mecca to Yathrib (now Medina). This event, known as the Hijrah, is commemorated in Islam for its role in the founding of the first Muslim community (ummah).

In the West, this era is most commonly denoted as AH (Latin: Anno Hegirae , 'in the year of the Hijra') in parallel with the Christian/Common (AD/CE) and Jewish eras (AM) and can similarly be placed before or after the date. In predominantly Muslim countries, it is also commonly abbreviated H ("Hijra") from its Arabic abbreviation hāʾ (هـ). Years prior to AH 1 are reckoned in English as BH ("Before the Hijrah"), which should follow the date.

A year in the Islamic lunar calendar consists of twelve lunar months and has only 354 or 355 days in its year. Consequently its New Year's Day occurs ten days earlier each year relative to the Gregorian calendar. The year 2023 CE corresponds to the Islamic years AH 1444 – 1445; AH 1444 corresponds to 2022 – 2023 in the Common Era.