| P. K. Banerjee | |
| Office: | Chargé d'affaires to China |
| Term Start: | 1962 |
| Term End: | 1962 |
| Primeminister: | Jawaharlal Nehru |
| Predecessor: | Ratan Kumar Nehru |
| Successor: | Jagat Singh Mehta |
| Office2: | Indian High Commissioner to Kenya |
| Term Start2: | 1964 |
| Term End2: | 1966 |
| Predecessor2: | Prem Krishen |
| Office3: | 1st Indian ambassador to Costa Rica |
| Term Start3: | 1968 |
| Term End3: | 1969 |
| Primeminister3: | Indira Gandhi |
| Successor3: | Vishnu Kalyandas Ahuja |
| Office4: | Indian ambassador to Thailand |
| Term Start4: | 1969 |
| Term End4: | 1971 |
| Predecessor4: | K. R. Narayanan |
| Successor4: | Romesh Bhandari |
| Office5: | 6th Indian permanent representative to the United Nations Office at Geneva |
| Term Start5: | August 1971 |
| Term End5: | August 1973 |
| Primeminister5: | Indira Gandhi |
| Predecessor5: | Natarajan Krishnan |
| Successor5: | Brajesh Mishra |
| Birth Date: | 7 December 1917 |
| Birth Place: | Kolkata, India |
| Death Date: | 2003 |
Purnendu Kumar Banerjee (7 December 1917 – 2003) was Indian Chargé d'affaires in Beijing during the India-China border conflict, also called the Sino-Indian War. He wrote a short book on his encounters with Zhou En Lai (1898–1976). Banerjee was a recipient of the 1963 Padma Shri award, India's fourth highest civilian award. In 1969, he became India's first ambassador to Costa Rica.[1] He was the sixth Ambassador in the Permanent Mission of India to the UN Office in Geneva.[2]