Bicol Isarog Transport System, Inc. (BITSI, also known as simply Bicol Isarog) is a Philippine bus company based in Concepcion Grande, Naga City, Camarines Sur. Bicol Isarog, along with 6 sister bus lines, operates routes that primarily serves the Bicol Region, as well as Samar Province and Leyte Province.
Bicol Isarog Transport System Inc. was formally incorporated in the Securities and Exchange Commission on April 19, 2011.
The company has then been operating the Penafrancia and Isarog Lines to include several more bus routes which makes Bicol Isarog TSI the leading bus company in the south of Luzon.
With the recent partnership with VSPintados, the company now even expands its services bringing people safer in the Eastern Visayas region particularly in Calbayog, Catbalogan, Tacloban, Ormoc and Maasin Leyte.