Wahidi ( ') was a sultanate in South Arabia, now part of Yemen. It lay along the Gulf of Aden and bordered BayḥÃÂn to the north, the Upper and Lower ÿAwlaqë sultanates to the west and the Quÿayá¹Âë sultanate in the east. Its main cities were Mayfaÿa, the administrative centre; ÿAzzÃÂn, the seat of the ruling dynasty; ḤabbÃÂn, the commercial centre; QanÃÂ; Biþr ÿAlë; and al-Ḥawá¹Âa.
Wahidi was supposedly founded by a certain ÿAbd al-WÃÂḥid. He is usually dated to the early 19th century, but Bal-Faqëh al-Shiḥrë puts him about two centuries earlier. His tomb was said to lie in the mosque of ḤabbÃÂn. The sultanate split in the 1880s, with the Wahidi rulers of Biþr ÿAlë and BalḥÃÂf becoming independent of the ruler of ÿAzzÃÂn and ḤabbÃÂn. By 1888âÂÂ1890, when the British signed treaties of protection with the rulers of the area, incorporating it into the Aden Protectorate, there were four states, their rulers known to the British by different titles: the ruler of Biþr ÿAlë was a sultan, that of BalḥÃÂf a tribal chief and those of Ḥawra and ÿIrqa shaykhs.