Tengku Muhammad Iskandar Ri'ayatuddin Shah ibni Al-Sultan Abdullah Ri'ayatuddin Al-Mustafa Billah Shah (; born 3 August 1997) is a member of the Pahang royal family who is the Tengku Arif Bendahara. He is the second son of the current Sultan of Pahang, Abdullah and his consort Tunku Azizah Aminah Maimunah Iskandariah, the Tengku Ampuan of Pahang.
As his father is the current Sultan of Pahang, Tengku Muhammad occupies the second position in the line of succession to the Pahang throne after his brother, Tengku Hassanal Ibrahim Alam Shah. He is also the Head of the Pahang State Customs Council and Representative of the Royal Family.
Tengku Muhammad attended the Caldicott Preparatory School in Buckinghamshire, from 2007 to 2010, and continued his A Levels in Harrow School in London. He pursued his degree in International Business Management at Oxford Brookes University, from 2015 to 2018, and graduated with a Bachelor of Arts in International Studies from University of Buckingham, in 2020.
On 15 August 2019, Tengku Muhammad was conferred the title Tengku Arif Bendahara by his father, Abdullah of Pahang.
In April 2024, Tengku Muhammad was appointed Chairman of Shahzan Alam Muda Sdn. Bhd., a subsidiary in which EDOTCO Malaysia holds an 80% stake, serving as the sole One Stop Agency (O.S.A.) for telecommunications infrastructure facilitation in Pahang.
On 9 June 2025, he joined the board of Citaglobal Bhd as an independent non-executive director, contributing to corporate governance in a firm focused on construction and property development sectors.
Tengku Muhammad married Tengku Natasya Puteri, the daughter of Tengku Adnan Tengku Mansor on 24 October 2024 at Balai Mahkota Istana Abdulaziz, Kuantan, Pahang.
Tengku Muhammad is passionate about sports such as football, polo, and golf. He has represented his country in equestrian polo at the 2025 SEA Games.