Datuk Mokhzani bin Tun Dr. Mahathir (born January 1961) is the second son of Former Prime Minister of Malaysia Tun Dr. Mahathir Mohamad and Tun Dr. Siti Hasmah. Like his younger brother Mukhriz, Mokhzani is a businessman and had played an active role in United Malays National Organisation (UMNO), and at one time serving as the Youth's Wing treasurer. As of 2006, Mokhzani was an UMNO delegate of one of the constituencies in Kedah, but has since laid dormant in his political activities. In May 2008, he followed his father's footsteps to quit UMNO, after 22 years as a member of the Sungai Layar Hujung branch of UMNO.
Mokhzani has been listed as the 19th richest person in Malaysia by Forbes Asia with an estimated net worth of US$290 million in 2008. Mokhzani is also the chairman of the Sepang International Circuit