[2] He is a member and the Division Chief of Simpang Renggam of the United Malays National Organisation (UMNO), a component party of the BN coalition.

[4] On 15 March 2022, Onn Hafiz was officially sworn in as the new and 19th Menteri Besar of Johor, the 4th officeholder in just a single term of Parliament of Malaysia.

Initially after the 2022 Johor state election, BN Chairman and UMNO President Ahmad Zahid Hamidi revealed that he would submit the name of his predecessor and caretaker Menteri Besar Hasni Mohammad to the Sultan of Johor for Hasni to be reappointed to the position after BN gained landslide victory in the election.

In April 2019, Onn Hafiz was a witness in former prime minister Najib Razak’s corruption trial, which involved millions of ringgit linked to state fund 1Malaysia Development Berhad (1MDB).

He testified to the Kuala Lumpur High Court that his company Vital Spire received a cheque for RM240,000 from Najib to launch the Malaysian Digest portal.