Washirazi (pia Wambwera) ni kabila la watu wa visiwa vya Bahari Hindi, hasa vile vya Zanzibar na Komoro. Asili yao inahushishwa na Shiraz na pwani ya Uajemi (sasa Iran). Washirazi walichangia sana uenezi wa Uislamu, uanzishaji wa usultani wa Waarabu na lugha ya Kiswahili, pamoja na kutajirika kwa biashara ya watumwa na bidhaa mbalimbali kutoka bara la Afrika iliyofanyika kutoka vituo vyao visiwani. Hadi leo karibu wote wanaongea lahaja za Kiswahili na kufuata dini ya Uislamu. Katika karne ya 20 jina la "Shirazi" lilipata umaarufu wa kimataifa wakati wapinzani wa utawala wa Kiarabu kisiwani Unguja walifanya mapinduzi ya Zanzibar kwa jina la "Afro Shirazi Party" iliyoendelea kutawala Zanzibar hadi mwaka 1977 ilipounganika na TANU ya bara na kuwa Chama cha Mapinduzi na hivyo kuacha jina lake. The Bantu-speaking slaves sourced from the East Africa coast are called Zanj in Islamic literature. Tanzania Ethnic Groups, East Africa Living Encyclopedia, accessed 28 June 2010 (2010) Encyclopedia of Africa. Oxford University Press, 379. ISBN 978-0-19-533770-9. “Most scholars, however, believe that the Shirazi actually began their settlement of the East African coast in the twelfth century and that they originated in Somalia.