Tatbir (Arabic: تطبير, romanized: Taṭbīr) is a form of self-flagellation rituals practiced by some Shia Muslims in commemoration of the killing of Husayn ibn Ali and his partisans in the Battle of Karbala by forces of the second Umayyad caliph Yazid I (r. 680–683).

The ritual is practiced in the Islamic month of Muharram, usually on Ashura. Tatbir involves striking oneself with chains or swords. It has been considered haram ("forbidden") by Shia scholars/imams, who cite it as self-harm.

Tatbir, also called Zanjeer Zani or Qama Zani,^[1] is practiced by some Shia Muslims on the day of Ashura on the 10 Muharram of the Islamic calendar and on the 40th day after Ashura, known as Arba'een (or Chehelom in Persian) by Twelver Shias around the world.^[2][3] Some Shia may also perform tatbir on other occasions as well.

The practice of Tatbir includes striking oneself with a talwar, a type of sword, on the head, causing blood to flow in remembrance of the pain felt by Husayn ibn Ali. Some also hit their back and/or chest with blades attached to chains.

Tatbir are contested among Shia clerics.^[4] While some traditionalist clerics allow believers to indulge in tatbir, modernist clerics deem it impermissible because it is considered self-harm, thus haram in Islam.^[5] Most religious authorities associate all forms of self-flagellation and blood-letting as ways to relate to painful deaths during the battle of Karbala by Imam Husayn and supporters.^[6]

• There are different opinion about the practice of Tatbir. Some Shia Marja believe that it is a form of self-harm, so it must be forbidden. According to some Shia Marja, it is felt Tatbir reflects on Shia observers poorly, so they typically advise to avoid it in a region where Sunnis also reside.
• Iraqi sociologist Ibrahim al-Haidari has called Tatbir an irrational act. He states blood donations should replace Tatbir. Iraqi cleric Hussein Al-Sadr and his followers donate blood every year during the mourning of Husayn ibn Ali.^[34]
• Hassan Nasrallah, the leader of Hezbollah in Lebanon, has also taken steps to end Tatbir. Instead of practicing Tatbir, he offered to donate blood on Ashura day to patients who need it.^[35]
• Mohammad Mehdi Shamseddine established a blood bank in Najaf to donate blood on Ashura day to patients who need it.^[36]

• Mourning of Muharram
• Battle of Karbala
• Criticism of Twelver Shia Islam
• Self-flagellation