| OC | a positional system of numeration that uses octal digits and a radix of 8 |
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| OC | a verse line having eight metrical feet |
| OC | any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent |
| OC | a measure of the antiknock properties of gasoline |
| OC | a measure of the antiknock properties of gasoline |
| OC | a dicarboxylic acid found in cork |
| OC | of or relating to or shaped like an octagon |
| OC | the constellation that includes the southern celestial pole |
| OC | a measuring instrument for measuring angles to a celestial body |
| OC | a rhythmic group of eight lines of verse |
| OC | a musical interval of eight tones |
| OC | a feast day and the seven days following it |