Canon Ring Flash on a Nikon camera?

I'm selling my Canon Ring Flash and would like to know if it would work on a Nikon camera, as I have a interested buyer who has asked me if it would, and as I only ever used Canon and still new to photography, I'm not too sure.

I doubt that your Canon Ring Flash would be compatible with a Nikon DSLR. Canon and Nikon arrange the connections on the hot shoe to match their flash units. Its possible that the flash wouldn't even fire. Another consideration is a Canon flash such as yours is designed to work with the Canon E-TTL flash control circuitry while a Nikon flash is designed to work with the Nikon i-TTL flash control circuitry. There would be no compatibility.

Sell your flash to a Canon user.

I think it should work if both flash and camera are in manual modes. Definitely do not try TTL. You might fry something. Verify first. I use a Nikon SB flash (Auto or Manual mode) on a Pentax dSLR (Manual mode).