Osamah Ali Almarwai
Yemeni grappler Osamah Almarwai took a path from Saudi Arabia to Atos and won the 2022 IBJJF No-Gi World Championship at black belt.
Biography
Sources for this profile
BJJ Heroes, “Osamah Almarwai,” accessed 8 September 2026.(opens in a new tab)
The subject profile gives his full name as Osamah Ali Almarwai, identifies Osa as his nickname, and dates his birth to 11 April 1992 in Jeddah, Saudi Arabia.
Where in the source: Osamah Almarwai Jiu-Jitsu — Full Name and Nickname; Biography — born April 11, 1992
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Almarwai trained in Saudi Arabia from 2011 to 2018, earned purple belt from Gerardo Dudamell and brown belt from Karim Shah, then moved to the United States and joined Atos in California.
Where in the source: Biography — Saudi training and move from Fight Sports to Atos
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André Galvão promoted Almarwai to black belt in early 2022, and Almarwai represented Atos in international competition.
Where in the source: Profile introduction, Team/Association and Biography — black-belt promotion
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ONE Championship, “Osamah Almarwai,” accessed 8 September 2026.(opens in a new tab)
ONE Championship identifies Almarwai as a Yemeni grappler born and raised in Saudi Arabia and known as Osa.
Where in the source: About Osamah Almarwai — opening paragraph
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ONE’s athlete biography says Almarwai joined Atos in San Diego in 2019, won the 2021 IBJJF No-Gi World Championship at brown belt, and became an IBJJF black-belt world champion in December 2022.
Where in the source: About Osamah Almarwai — Atos arrival, 2021 brown-belt title and December 2022 title
Accessed:
Ben Coate, “Osamah Almarwai Determined To Win Middle East Homecoming At ONE 166,” ONE Championship, 7 February 2024.(opens in a new tab)
In a 2024 ONE interview, Almarwai described returning to compete in the Middle East as a black belt and framed his career as proof that grapplers from the region could succeed internationally; the article also reported that he was training at Atos under André Galvão.
Where in the source: Interview introduction and sections on regional representation and Atos training
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Michelle Kuehn, “Yemeni jiu-jitsu champion aims to bring world title home to Middle East,” Arab News, 3 May 2023.(opens in a new tab)
In a 2023 interview, Almarwai connected jiu-jitsu’s technical problem-solving to his engineering background and described the pressure and motivation he felt representing Yemen and the wider Middle East.
Where in the source: Interview passages on engineering, problem-solving and regional representation
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Ben Coate, “Mikey Musumeci To Defend Submission Grappling World Title Against Osamah Almarwai At ONE Fight Night 10,” ONE Championship, 14 February 2023.(opens in a new tab)
ONE Championship reports that Almarwai won the 2022 IBJJF No-Gi World Championship during his first year competing as a black belt.
Where in the source: Career section identifying his early-2022 black-belt promotion and first place at the 2022 IBJJF No-Gi World Championships
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