"It was great to be able to come back and win this year and finally finish it off," said George, whose interests include reading, writing, swimming and gaming.
Four students made it to the final round but only George managed to spell his word correctly.
New Zealand Spelling Bee founder Janet Lucas said the field was so strong there were moments where she thought there would be nine runners-up.
"George did incredibly well to triumph in such a strong group of spellers, and to come runner-up last year and now to be champion this year shows just how strong a competitor he is," she said.
The New Zealand Spelling Bee is in its 14th year and also included a resource for primary school pupils to hold classroom competitions.
