M&B

M&B may refer to:
 * May & Baker, a British chemical company
 * the drug Sulfapyridine, manufactured by May & Baker
 * Mills & Boon, the romance imprint of British publisher Harlequin UK Ltd.
 * Meridian and Bigbee Railroad, a U.S. railroad
 * Mount & Blade, a computer game
 * Mitchells & Butlers, a British pub chain company
 * Mitchells & Butlers Brewery