Philippines: does PD 1083 permit polygyny?

Yes, but only as an exception in "exceptional cases" and if the husband is able to be just. Art. 27 of the Code of Muslim Personal Laws (PD 1083) states that a Muslim man may have up to four wives at one time, but may not have more than one wife unless he can deal with them with equal companionship and just treatment as enjoined by Islamic law. The Supreme Court in Malaki v. People (2021) read it as: the general rule is that a married man may not marry again. The procedure under Art. 162: written notice to the Clerk of the Shari'a Circuit Court, a copy to the existing wife, and an Agama Arbitration Council if the wife objects. The Code does not explain what "exceptional cases" means. See Philippines.