List of senators of the Philippines in the 16th Congress by seniority

This is a complete list of senators of the Philippines during the 16th Congress of the Philippines listed by seniority from June 30, 2013, to June 30, 2016.

The criteria for seniority used in this article are derived from the cumulative length of service of a member of the Senate prior to the current Congress. Although an official roster ranking senators by seniority is not publicly available, their total cumulative years of service have been used to determine seniority. It has long been customary, following the practice of the United States Senate, to elect the most senior senator as either president of the Senate or president pro tempore, although this practice has become less common in the modern Senate. Furthermore, seniority is traditionally considered in the selection of chairpersons of major Senate committees.

In cases where senators have equal cumulative service, seniority is determined by the following criteria, in order: Longest uninterrupted period of service Earlier date on which the cumulative length of service was achieved Alphabetical order of surnames

In this Congress, Juan Ponce Enrile was the most senior senator, having previously served 19 years in Senate, while Cynthia Villar was the most junior senator.

List of senators by seniority Rank Senator Party Length of previous tenures Notes Start of Congress End of Congress 1 Juan Ponce Enrile PMP 19 years, 320 days 2 Tito Sotto NPC 15 years, 0 days 3 Franklin Drilon Liberal 15 years, 0 days Senate president 4 Serge Osmeña Liberal 5 Miriam Defensor Santiago PRP 15 years, 0 days 6 Gregorio Honasan UNA 15 years, 0 days 7 Loren Legarda NPC 12 years, 0 days 8 Ralph Recto Liberal 9 years, 0 days Senate president pro tempore 9 Pia Cayetano Nacionalista 9 years, 0 days 10 Jinggoy Estrada PMP 11 Lito Lapid Independent Lingap Lugud 12 Bong Revilla Lakas 13 Francis Escudero Independent 14 Alan Peter Cayetano Nacionalista 15 Antonio Trillanes Nacionalista 16 Bongbong Marcos Nacionalista 17 TG Guingona Liberal 18 Koko Pimentel PDP–Laban 19 Sonny Angara LDP 20 Bam Aquino Liberal 21 Nancy Binay UNA 22 JV Ejercito UNA 23 Grace Poe Independent 24 Cynthia Villar Nacionalista

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