Republic Act No. 9225 is an Act making the citizenship of Filipinos who acquire foreign citizenship permanent, amending for the purpose Commonwealth Act No. 63.

RA 9225, which took effect on 17 September 2003, declares that former natural-born Filipino citizens who acquired foreign citizenship through naturalisation are deemed not to have lost their Philippine citizenship under conditions provided in the Act.

There former Filipinos can re-acquire/retain their Philippine citizenship by taking the oath of allegiance to the Republic of the Philippines.