Raja Dahar (Sindhi: راجا ڏاھر‎; Sanskrit: राजा दाहिर, IAST: Rājā Dāhir; 663 – 712 AD) was the last Hindu ruler of Sindh. He presided over the Pushkarna Brahmin Dynasty of Sindh, which included territories that now constitute parts of the modern-day states of Afghanistan, the Balochistan region of Iran and Pakistan, and parts of Punjab. In 711 AD, his kingdom was conquered by Muhammad bin Qasim, an Arab general, for the Umayyad Caliphate. He was killed at the Battle of Aror at the banks of the Indus River, near modern-day Nawabshah.

The Chach Nama is the oldest chronicles of the Arab conquest of Sindh. It was translated in Persian by Muhammad Ali bin Hamid bin Abu Bakr Kufi in 1216 CE from an earlier Arabic text believed to have been written by the Thaqafi family (relatives of Mukhtar al-Thaqafi).

Dahir's kingdom was invaded by King Ramal of Kannauj. According to legend Raja Dahir granted refuge to a disloyal Muslim betrayer Muhammad Haris Allafi, who killed the Muslim governor of Makran. He also fought for Dahir during attack over Sindh by ruler of Kannauj in 687 AD.

Following the footsteps of his father Chandar of Sindh who dispatched an army against the Umayyads referred to as Hussaini Brahmins to the Battle of Karbala to protect Husayn ibn Ali, Dahir allied himself with Ali ibn al-Husayn the chief of the Aliids and Bani Hashim, referred to as the Alawi in Arabic and Alafi in Sindhi. Dahir gave his daughter Jodha in marriage to him who is known as Jayda al-Sindhi, mother of Zayd ibn Ali in Muslim history. According to legends, the Alafi warriors (who were exiled from the Umayyad caliph) were recruited; they led Dahir's armies in repelling the invading forces, remaining as valued members of Dahir's court. In a later war with the caliphate, however, Alafi served as a military adviser but refused to take an active part in the campaign; as a result, he later obtained a pardon from the caliph.

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