Who is called the watchdog of public finance?

The Comptroller and Auditor General (CAG) of India is the guardian of the public purse and controls the entire financial system of the country at both the levels – the Centre and the state. He is one of the bulwarks of the democratic system of government in India.  

Further Reading:

• Comptroller and Auditor General of India
• Controller General of Accounts (CGA)
• Public Accounts Committee