This is a complete list of senators of the Philippines during the 14th Congress of the Philippines listed by seniority from June 30, 2007, to June 30, 2010.

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 17 years in Senate, while Juan Miguel Zubiri 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 17 years, 0 days 2 Nene Pimentel PDP–Laban 14 years, 0 days 3 Juan Ponce Enrile PMP 13 years, 320 days Senate president (from November 17, 2008) 4 Rodolfo Biazon Liberal 12 years, 0 days 5 Miriam Defensor Santiago PRP 9 years, 0 days 6 Gregorio Honasan Independent 7 Loren Legarda NPC 8 Joker Arroyo KAMPI Lakas 9 Panfilo Lacson Independent 10 Kiko Pangilinan Liberal 11 Manny Villar Nacionalista Senate president (until November 17, 2008) 12 Pia Cayetano Nacionalista 13 Jinggoy Estrada PMP Senate president pro tempore 14 Dick Gordon Lakas Bagumbayan–VNP 15 Lito Lapid Lakas 16 Jamby Madrigal PDP–Laban Independent 17 Bong Revilla Lakas 18 Mar Roxas Liberal 19 Benigno Aquino III Liberal rowspan="5" Resigned on June 30, 2010, upon taking office as President of the Philippines. 20 Francis Escudero NPC Independent 21 Alan Peter Cayetano Nacionalista 22 Antonio Trillanes United Opposition Nacionalista Under detention for his involvement in the Oakwood mutiny and the Manila Peninsula siege. 23 Juan Miguel Zubiri Lakas

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