O&M

The abbreviation O&M can stand for:

Organizations

 * Ogilvy and Mather, an advertising, marketing, and public relations agency
 * Ohio and Mississippi Railway
 * Ovens & Murray Football League
 * Owens & Minor, a healthcare logistics company

Other uses

 * Observations and Measurements, in information science
 * Operations and maintenance
 * Organization and Methods (management)
 * Orientation and mobility, training for visually impaired people