Pen-Ek Ratanaruang
- Birthday: 1962-03-08
- Place of birth: Bangkok, Thailand
- Also know as: 뻰엑 라따나루앙
Pen-Ek Ratanaruang (Thai: เป็นเอก รัตนเรือง) A Thai film director and screenwriter best known for his arthouse work "Last Life in the Universe", and is considered to be one of Thai cinema's leading "new wave" auteurs, alongside Wisit Sasanatieng and Apichatpong Weerasethakul. He goes by the nickname Tom and is sometimes credited as Tom Pannet.
