Ismail bin Omar Abdul Aziz[a] (1911 – 3 February 1994) was a Malaysian aristocrat and Muslim scholar who served as the first State Mufti of Brunei from 1962 to 1965 and again from 1967 until his passing in 1994.

[2] After returning from Egypt in 1949, Ismail was appointed as an Arabic school inspector and editor of Warta, a publication under the Johor Religious Affairs Department, serving in this role until 1952.

In 1955, he was seconded to become the principal of the newly established Kolej Islam Malaya, located in a waqf palace of Sultan Hisamuddin Alam Shah in Selangor.

At the request of Sultan Omar Ali Saifuddien III, they assessed the possibility of establishing a government religious school system in the country.

Although the mufti's editorials in the Pelita Brunei were his personal opinions and not a ruling, a top government official stated that Muslims would still be expected to follow his counsel.

[4] He was an excellent figure who has the ability and can be identified through various aspects, such as personality, trustworthy nature, extensive knowledge, steadfast and courageous attitude, and fiery spirit.

[2] Ismail died on 3 February 1993, at the age of 82, in the Raja Isteri Pengiran Anak Saleha Hospital in Bandar Seri Begawan.

As the first mufti of Brunei, his leadership was defined by his ability to deliver clear, resolute religious rulings, earning him widespread admiration and acknowledgment.

His efforts also played a crucial role in strengthening the relationship between Brunei and Johor, further solidifying his legacy as a leader who valued both faith and diplomacy.

[10] On 1 February 1968, Ismail was honoured by Sultan Hassanal Bolkiah with the manteri title of Pehin Datu Seri Maharaja, bearing the style Yang Dimuliakan Lagi Dihormati.