Tunneling. Unless You're in the U.K. or Australia.

Someone requested that I cover the spelling of tunneling. “Is it tunneling or tunnelling?”

In the U.S., tunneling is correct. Tunnelling is the British spelling.

Other (common) words like this:

American: judgments, analyze, theater, enrollment, catalog, dialog, meter

British: judgements, analise, theatre, enrolment, catalogue, dialogue, metre

Filed under: American English, British English, Spelling