The Municipal Departments of Tinambac are headed by the following
| DEPARTMENTS | DEPARTMENT HEAD |
| MAYOR’S OFFICE | MAYOR RUEL B. TUY |
| SANGGUNIANG BAYAN | BENEDICTO B. BESA |
| MUNICIPAL BUDGET OFFICE | JOSEPH M. BAÑES |
| HUMAN RESOURCE MANAGEMENT OFFICE | NIÑA T. PARDE |
| MUNICIPAL ACCOUNTING OFFICE | SUSANA GUERERO (OIC) |
| MUNICIPAL TREASURER’S OFFICE | MA. TERESA H. BETITO (OIC) |
| MUNICIPAL PLANNING DEVELOPMENT OFFICE | ENGR. DIEGO E. BAYONITO |
| MUNICIPAL CIVIL REGISTRAR | JESUSA L. CACERES |
| MUNICIPAL ASSESSOR’S OFFICE | RAQUEL T. HILOMA |
| GENERAL SERVICES OFFICE | ARIEL E. BAYONITO |
| MUNICIPAL ENGINEER OFFICE | ENGR. BERLIN H. DIMACULANGAN |
| MUNICIPAL PUBLIC EMPLOYMENT AND INFORMATION OFFICE | ARNEL R. ABIOG |
| MUNICIPAL SOCIAL WELFARE AND DEVELOPMENT | NILDA P. EVALLA |
| MUNICIPAL AGRICULTURAL OFFICE | ENGR. REYNALDO A. RIVERA |
| TINAMBAC MUNICIPAL HOSPITAL | DR. JOHN PAUL REAZON (CHIEF OF HOSPITAL) |
| MUNICIPAL HEALTH OFFICE (RHU-I) | DR. JOHN PAUL REASON (OIC-MHO) |
| MUNICIPAL HEALTH OFFICE (RHU-II) | DR. MILADE BRIONES |
| MUNICIPAL CULTURAL OFFICE | CHARLIE DIN |
| MUNICIPAL TOURISM OFFICE | MA. GRACE P. YALUNG |
| BUREAU Of INTERNAL REVENUE (BIR) | FRDINAND S. ALTARES (RCO1) |
| COMMISSION ON AUDIT (COA) | |
| COMMISSION ON ELECTION | KIRK THOMAS TATE |
| DEPARTMENT OF INTERIOR AND LOCAL GOVERNMENT | JOSEPH RIO O. ARMENTA (LGOOVI) |
| PHILIPPINE NATIONAL POLICE | PCI GARY MANGENTE |
| BUREAU OF FIRE PROTECTION | SFO4 PIO A. LAGARDE JR. |
| MUNICIPAL DISASTER RISK REDUCTION AND MANAGEMENT OFFICE | ROMIL ESTOLANO (LDRRMOIII) |
| TINAMBAC PUBLIC SAFETY OFFICE (TPSO) | DWIGHT BORJA |
| TINAMBAC MARKET | TEODORO LAGUERDA |
| TAMBAN PORT | ALEX BRUGADA |