List of senators of the Philippines in the 15th Congress by seniority

This is a complete list of senators of the Philippines during the 15th Congress of the Philippines listed by seniority from June 30, 2010, to June 30, 2013.

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, Edgardo Angara was the most senior senator, having previously served 20 years in Senate, while Koko Pimentel 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 Edgardo Angara LDP 20 years, 0 days 2 Juan Ponce Enrile PMP 16 years, 320 daysSenate president (until June 5, 2013) 3 Tito Sotto NPC 12 years, 0 days 4 Franklin Drilon Liberal 5 Serge Osmeña Independent 6 Miriam Defensor Santiago PRP 12 years, 0 days 7 Gregorio Honasan Independent UNA 12 years, 0 days 8 Loren Legarda NPC 9 years, 0 days 9 Joker Arroyo Lakas 10 Panfilo Lacson Independent 11 Kiko Pangilinan Liberal 12 Manny Villar Nacionalista 13 Ralph Recto Liberal 14 Pia Cayetano Nacionalista 15 Jinggoy Estrada PMP Senate president pro temporeSenate president (acting, from June 5, 2013) 16 Lito Lapid Lakas 17 Bong Revilla Lakas 18 Francis Escudero Independent 19 Alan Peter Cayetano Nacionalista 20 Antonio Trillanes Nacionalista 21 Juan Miguel Zubiri Lakas colspan="2" Resigned on August 3, 2011, amid an on-going electoral protest. 22 Bongbong Marcos Nacionalista rowspan="3" 23 TG Guingona Liberal 24 Koko Pimentel PDP–Laban Took office on August 15, 2011, after winning an electoral protest against Juan Miguel Zubiri.

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