Married to a former defence officer Parminder Mahajan, Poonamben Mahajan (b 1974) is a politician from Gujarat state in India. She is the Member of Parliament, Lok Sabha from Jamnagar. Earlier, she was a member of Gujarat Legislative Assembly from Khambhalia in Dwarka district.

She is also the former member of the Gujarat Legislative Assembly from 2012 to 2014. She contested the 2014 Lok Sabha elections from Jamnagar's seat as the BJP candidate and won against her uncle Vikram Maadam of Congress.

In 2024 Lok Sabha Election Poonamben won against Congress candidate J.P. Maraviya with 620049 votes.
She has been the Member of Committee on Communications and Information Technology, Committee on Public Undertakings, Joint Committee on the Multi-State Co-operative Societies (Amendment) Bill, Member, Consultative Committee, Ministry of Civil Aviation, Committee on Empowerment of Women, Standing Committee on Industry, Committee on Public Undertakings.