December 10 – A major blackout knocked out power to Luzon Island, disrupting the economy. This one was attributed to the enormous school of jellyfish.[2]
Date Unknown
January – Diplomatic relations between Palau and the Philippines reached an all-time low with Palau President Kuniwo Nakamura threatening to sever diplomatic ties between his country and the Philippines over repeated crossing of Filipino fishers into Palau's EEZ.[3][4]
January 21 – Dr J Ana Water Dispenser captured the 1999 2nd Yakult PBL Centennial Cup crown, becoming the 1st title to win the tournament, defeating Tanduay Gold Rhum Masters, three games to two.
July 1 – The Welcoat House Paints were crowned the 1999 Yakult-PBL Challenge Cup champions after clinching an 80–74 victory over the Red Bull energy Drink in a Game 4 for the title at the Makati Coliseum
December 8 – The Manila Metrostars rout the Cebu Gems, 101–83 in Game Six, before a hometown crowd at the Mail & More Sports Complex in San Andres and crowned themselves the 1999 MBA national champions.
December 12 – The San Miguel Beermen captured their second straight title of the season with a 4–2 series victory over Alaska Milkmen. The Beermen won their 13th PBA crown and are now the winningest ballclub, tied with the famed Crispa Redmanizers for most titles.
