Officer is a suburb in Melbourne, Victoria, Australia. Its Local Government Area is the Shire of Cardinia.

The suburb is named after the Officer family, who were early settlers in the area. A timber industry was established, and by 1870 timber was being transported from the railways sidings named Officer's Wood Siding. This was shortened to Officer's and later, Officer. A brickmaking industry began in the 1880s, but died away after the collapse of the land boom.

Officer is home to the R.O.C football club (Rythdale, Officer, Cardina.). They last won the premiership in 2002

Despite now being considered a suburb and having its own railway station, most of the land around Officer is undeveloped, much of which is used for farming. This is slated to change after 2006, when construction of a 4,000 lot housing estate ^* is to begin at Officer.