Marcelo "Celing" Briones Fernan (October 24, 1927 – July 11, 1999) was a Filipino lawyer and political figure.

He is also the third Filipino to have headed both the judicial and legislative branches of government, after Querube Makalintal who served as Chief Justice and Speaker of the Batasang Pambansa in the 1970s, and José Yulo, who served as Chief Justice and Speaker of the House of Representatives before 1946.

In 1984, during the Marcos regime, he was elected to the Regular Batasang Pambansa, then the country's unicameral parliament with Antonio Cuenco, representing the at-large district of Cebu City under the banner of the opposition UNIDO party and actively scrutinized the bills presented by the administration lawmakers and delivered privilege speeches against the Marcos regime.

On 1986, after the snap elections, he was the one of the opposition lawmakers who walked out when the administration lawmakers after a canvassing session that was then filled with debates and tensions, proclaimed then President Ferdinand E. Marcos and his running mate, then former Senator Arturo Tolentino as the winners of that year's snap presidential and vice presidential polls in which the opposition claimed was marred with fraud.

He later accepted the offer of House Speaker Ramon Mitra as his vice presidential candidate of the Laban ng Demokratikong Pilipino.

Fernan became an ordinary senator and attended committee hearings and meetings and plenary sessions even in a wheelchair but died of cancer days later, on July 11 in Manila.

For weekends, he loved bringing his family to the beaches in Mactan, Cebu and Bogo to snorkel or to ride a pump boat to visit nearby islands.