He was a teacher in Sekolah Menengah Kebangsaan Sultan Abdul Aziz Shah in 1983 and went on to work as a legal officer at Majlis Amanah Rakyat (MARA) in 1988 before starting his own law firm, Ahmad Famy & Noh.
[8] Noh was among a number of high-profile United Malay National Organisation (UMNO), a component party of BN, members not selected to contest in the 2022 election.
In response to the revelation of mistreatment and protests by the Chinese government, Noh stated "if foreigners think that Malaysia police are brutal, please go back to their own countries and not to stay here".
[16] In 2012, Noh Omar was accused of conflict of interest and abusing his power as Minister for Agriculture and Agro-based Industry and member of parliament for Tanjong Karang for entering a joint-venture to run a prawn farm in 2011 on 30-acres of land, which he had allegedly bought for RM100,000 at below market price, with the certificate of ownership being issued by the Selangor Land Ownership Registrar in September 2009, five months after Noh was appointed to his current cabinet position.
He was criticised for misusing resources from the Ministry of Urban Wellbeing, Housing and Local Government, which he is the minister of, to hold campaign events in Gombak.
Bersih, a non-governmental organisation dedicated to electoral reform referred to the act as "bribery" and "an attempt to unduly influence voters".
Riding a motorcycle without a helmet is not wrong; only when the police arrest you, it becomes wrong.”[26] Noh Omar gave the analogy while trying to demand equal treatment for politicians entering schools, as principals who had allowed him to enter their premises had been warned by the State Education Department, as existing regulations necessitated that politicians receive clearance from the State Education Departments before any school visits.
Noh claimed that this regulation was not enforced by previous Barisan Nasional governments, whilst RSN Rayer from the Democratic Action Party, a component of the then-ruling Pakatan Harapan coalition countered that its members of parliament were denied entry to visit schools by respective State Education Departments under previous Barisan Nasional governments when they were part of the opposition.
Noh is married to Prof. Dr. Aishah Salleh and the couple has one daughter; Nurul Syazwani, who is currently the Member of the Selangor State Legislative Assembly for Permatang.