He always acts in a self-interested manner.

The interest group organized a protest against the new government policies.

The government's policies heavily favored the landed interests.

He has a vested interest in the company's success.

This book is of great interest to me.

The interest rate is at an all-time low.

The detective interviewed the person of interest to gather crucial evidence.

Interestingly, I found a hidden treasure in my backyard.