Mohd Irwan Serigar bin Abdullah (born 7 March 1957) served as the Secretary General of the Treasury in the Ministry of Finance from 2011 to May 14, 2018.

Mohd Irwan started his career in the public sector in the Economic Planning Unit in the Prime Minister's Department in 1984.

[3][4] He was also a member of the Blue Ocean Strategy Group (NBOS) in the Economic Planning Unit, PRO3-Based Learning Project Steering Committee at the Germany-Malaysia Institute (GMI) also the Strategic API Steering Committee and the Strategic Planning Panel at the Ministry of Finance.

[6] On February 8, 2018, Mohd Irwan through MaGIC implemented another initiative with his partners, pioneering the Malaysian Socially Participating and Dynamic Entrepreneurship (MasSIVE) movement.

Along with former Malaysian prime minister Najib Razak, Mohd Irwan has been charged for criminal breach of trust in relation to the 1Malaysia Development Berhad scandal.

[8] Abdullah is the recipient of various awards and degrees at the federal, state and administrative levels, including in the Economic Planning Unit.