New Zealand felt like home and he thought it was about time he got his citizenship, Mr Parry said.
"Rotorua's the best city, it's so vibrant, energetic, diverse and unique.
"New Zealand is safe and beautiful."
The ceremony also included a kapa haka performance from Owhata Primary School pupils.
Each new Kiwi family or citizen received a book and a seedling.
Mrs Chadwick said the seedling symbolised putting roots down in the city.
The women also received a corsage and children received a pencil.
Those who became citizens included six Filipinos, one Korean, six South Africans, two Indians, two British, one Romanian, one American, one German, one Dutch, five Sri Lankans, four Fijians and one Australian.