Clement Nyong Isong CFR ((listenⓘ); 20 April 1920 – 29 May 2000) was a Nigerian banker and politician who was governor of the Central Bank of Nigeria from 1967 to 1975 during the military regime of General Yakubu Gowon.

He taught economics in the University of Ibadan before joining the Central Bank of Nigeria (CBN) as secretary, later becoming director of research.

[3] Isong complained that Nigeria was accumulating foreign reserves but had "nowhere to invest them properly", although there was huge scope for infrastructure improvements.

[5] After retirement from the CBN, Isong entered politics and was elected the first civilian Governor of Cross River State from 1979 to 1983 on the National Party of Nigeria (NPN) platform.

Etiebet won the NPN nomination and the subsequent election, taking office in October 1983, but the result was moot due to the resumption of military government after a coup by Major-General Muhammadu Buhari in December that year.