Ada Rongomatane Ariki (20 August 1948 – 9 January 2018), also known as Ada Teaupurepure Tetupu Nicholls, was a Cook Islands ariki. She held the title of Rongomatane Ariki, the principal title of the Paruarangi tribe on the island of Atiu. She served as President of the House of Ariki from 2006 to December 2008. She was the daughter of , and spent her childhood between Atiu and Rarotonga. After schooling, she worked in the post office and the Philatelic Bureau. In 1977, she was awarded the Queen Elizabeth II Silver Jubilee Medal.