| Opal Cone | |
| Elevation M: | 1,736 |
| Prominence M: | 86 |
| Location: | Garibaldi Park, British Columbia, Canada |
| District: | New Westminster Land District |
| Range: | Garibaldi Ranges |
| Coordinates: | 49.8272°N -122.9711°W |
| Topo Maker: | NTS |
| Type: | Cinder cone |
| Age: | Holocene |
| Volcanic Arc/Belt: | Canadian Cascade ArcGaribaldi Volcanic Belt |
| Last Eruption: | 9300 BP |
Opal Cone is a cinder cone located on the southeast flank of Mount Garibaldi in the Coast Mountains of British Columbia, Canada. It is the source of a 15sigfig=1NaNsigfig=1 long broad dacite lava flow with prominent wrinkled ridges. The lava flow is unusually long for a silicic lava flow.
Opal Cone is a member of the Cascade Volcanoes, but it is located in the Garibaldi Ranges in the Coast Mountains and not in the Cascade Range proper.