Iain Robert Rennie CNZM (born 1964) is a New Zealand economist and senior public servant.

[3] From 1989 to 1993 he was seconded to work as an economic advisor to opposition leader and (from 1990) prime minister Jim Bolger.

In his role as Commissioner, Rennie was involved in driving state sector reform in line with the Government's objectives.

The State Sector Amendment Act 2013 gave him greater responsibility for developing senior leadership and management capability, including appointments to key positions within the public service.

He was appointed independent chair of the Treasury's Financial Statements of Government Audit Committee in 2021.