Bicol Isarog Transport System, Inc. (BITSI, also known as simply Bicol Isarog) is a Philippine bus company based in Quezon City.

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.

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.

[1] Del Monte Motor Works Higer Bus Company Limited Hino Motors Philippines King Long United Automotive Industry Co., Ltd Santarosa Motor Works Modified & Custom-built buses by Five Star Bus Body: