A one-cent coin or one-cent piece is a small-value coin minted for various decimal currencies using the cent as their hundredth subdivision.

Examples include:

• the United States one-cent coin, better known as the US penny
• the Canadian one-cent piece, better known as the Canadian penny
• the Australian one-cent coin
• the New Zealand one-cent coin
• the Hong Kong one-cent coin
• the Singapore one-cent coin
• the Brunei one-cent coin
• the one-cent coin of the decimal Dutch guilder (Netherlands)
• the 1 cent euro coin used in several European countries known as the eurozone
• the one-cent coin of the South African rand