| ROC | any of several small lithophytic ferns of tropical and warm temperate regions |
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| ROC | a small cake with a hard surface said to resemble a rock |
| ROC | sugar in large hard clear crystals on a string |
| ROC | hard stick bright-colored stick candy typically peppermint flavored |
| ROC | a climber of vertical rock faces |
| ROC | an act of scaling rock masses on mountain sides |
| ROC | a performance of rock music |
| ROC | small plump hybrid developed by crossbreeding Plymouth Rock and Cornish fowl |
| ROC | flesh of a small fowl bred for roasting |
| ROC | crab of eastern coast of North America |
| ROC | any of several rock-loving cresses of the genus Arabis |
| ROC | a clear quartz used in making electronic and optical equipment |