| Micron | a metric unit of length equal to one millionth of a meter |
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| Micron | an oral antidiabetic drug (trade names DiaBeta and Micronase) that stimulates the release of insulin from the pancreas |
| Micron | the islands in the northwestern part of Oceania |
| Micron | a country scattered over Micronesia with a constitutional government in free association with the United States |
| Micron | trade name for and oral contraceptive containing the progestin compound norethindrone |
| Micron | a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) |