List of senators of the Philippines in the 17th Congress by seniority

This is a complete list of senators of the Philippines during the 17th Congress of the Philippines listed by seniority from June 30, 2016, to June 30, 2019.

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, Tito Sotto was the most senior senator, having previously served 18 years in Senate, while Joel Villanueva 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 Tito Sotto NPC 18 years, 0 days Senate president (from May 21, 2018) 2 Franklin Drilon Liberal 18 years, 0 days Senate president pro tempore (until February 27, 2017) 3 Gregorio Honasan UNA 18 years, 0 days 4 Loren Legarda NPC 15 years, 0 days 5Panfilo Lacson Independent 6 Kiko Pangilinan Liberal 7 Ralph Recto Liberal Nacionalista 12 years, 0 days Senate president pro tempore (from February 27, 2017) 8 Francis Escudero Independent NPC 9 Alan Peter Cayetano Nacionalista Resigned on May 17, 2017, upon being appointed as Secretary of Foreign Affairs. 10 Antonio Trillanes Nacionalista 11 Dick Gordon Bagumbayan–VNP 12 Koko Pimentel PDP–Laban Senate president (until May 21, 2018) 13 Juan Miguel Zubiri Independent 14 Sonny Angara LDP 15 Bam Aquino Liberal 16 Nancy Binay UNA 17 JV Ejercito PMP NPC 18 Grace Poe Independent 19 Cynthia Villar Nacionalista 20 Leila de Lima Liberal rowspan="5" Detained on February 24, 2017, for charges linked to the New Bilibid Prison drug trafficking scandal. 21 Sherwin Gatchalian NPC 22 Risa Hontiveros Akbayan 23 Manny Pacquiao UNA PDP–Laban 24 Joel Villanueva Liberal Independent

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