Vicente Castelo Sotto III, professionally known as Tito Sotto and also known as Tito Sen, is a Filipino politician, entertainer and athlete who served as Senate President from 2018 to 2022. Before that, he had two stints each as Senate Majority Leader and Senate Minority Leader. He served a total of four terms in the Senate: 1992 to 2004 and 2010 to 2022, tying the record for the longest-serving Senator with Lorenzo Tañada and Franklin Drilon. In between his stints in the Senate, he led the Dangerous Drugs Board for a year. He became the Vice Mayor of Quezon City from 1988 to 1992, and later unsuccessfully ran for vice president in the 2022 elections as Panfilo Lacson's running mate.

The president of the Senate of the Philippines, commonly referred to as the Senate president, is the presiding officer and the highest-ranking official of the Senate of the Philippines, and third highest and most powerful official in the government of the Philippines. They are elected by the entire body to be their leader. The Senate president is second in the line of succession to the presidency, behind only the vice president and ahead of the speaker of the House of Representatives.