Index - O
| okLab | Data.Colour.Ok |
| okLabView | Data.Colour.Ok |
| okLCh | Data.Colour.Ok |
| okLChView | Data.Colour.Ok |
| oldlace | Data.Colour.Names |
| olive | Data.Colour.Names |
| olivedrab | Data.Colour.Names |
| opaque | Data.Colour |
| orange | Data.Colour.Names |
| orangered | Data.Colour.Names |
| orchid | Data.Colour.Names |
| over | Data.Colour |