1990 in the Philippines

• President: Corazon Aquino (PDP-Laban)
• Vice President: Salvador Laurel (Nacionalista)
• Senate President: Jovito Salonga
• House Speaker: Ramon Mitra, Jr.
• Chief Justice: Marcelo Fernan
• Philippine Congress: 8th Congress of the Philippines

• January 30 – Majority of voters in the Cordillera Administrative Region reject the creation of an autonomous entity in what would be the region's first referendum, as provided by the Organic Act (Republic Act No. 6766) that has approved the previous year, with Ifugao as the only province to vote for it.^[1]

• February 12 – General elections are held for the first time in the newly created Autonomous Region in Muslim Mindanao for the Regional Governor and Vice-Governor.
• February 27 – Sen. Juan Ponce Enrile is arrested regarding his involvement in the December 1989 coup attempt.^[2]

• March 4 – Hotel Delfino in Tuguegarao, Cagayan is seized by suspended Cagayan governor Rodolfo Aguinaldo commanding his private army estimated at 300 men.^[3] His suspension as governor in January 1990 and his subsequent indictment on charges of rebellion and murder were both related to his support for the Dec. 1-9, 1989 failed coup attempt against President Corazon Aquino.^[4] Brig. Gen. Oscar Florendo, sent by Aquino to serve Aguinaldo with an arrest warrant,^[5] was captured by Aguinaldo's men and later shot in the hotel, he died of his wounds.^[6] Hours of standoff ensued until nearly 1,000 government troops^[3] attacked the hotel to dislodge Aguinaldo's forces.^[4] In this siege at least a dozen others were killed in or around the hotel.^[6] Following the melee, Aguinaldo fled with about 90 fighters for mountains in the north.^[7]

• April 25 – Two U.P. Students, Ernesto "Cochise" Bernabe II and his girlfriend Anna Lourdes "Beebom" Castanos were abducted and killed in Pampanga. Their decomposing bodies are found on June 25–26.

• May 13 – Gunmen kill two United States Air Force airmen near Clark Air Base on the eve of talks between the Philippines and the United States over the future of American military bases in the Philippines.

• June – U.S. Peace Corps remove 261 volunteers from the country amid Communist threats.^[8]

• July 2 – A court in New York, United States acquits former First Lady Imelda Marcos of racketeering and fraud charges regarding accusations of investing the Philippine treasury's money to the US.^[9]
• July 16 – An earthquake with a 7.8 M_s strikes Luzon.^[10] It kills around 2,000 and leaves damages of at least ₱10-billion, mainly from Metro Manila and regions in northern and central Luzon, especially Baguio, the most devastated, as well as Dagupan and Cabanatuan.^[11][12][13]

• September 28 – Sixteen military members are convicted and sentenced to life imprisonment regarding the 1983 assassination of Sen. Aquino.^[14]

• October 4–6 – Forces loyal to Col. Alexander Noble declare the independence of Mindanao and seize two military garrisons in Cagayan de Oro and Butuan. The rebels are isolated by government forces and Noble surrenders on October 6.

• November 12 – Typhoon Ruping slams Visayas and affects Cebu City, Bacolod, and other key cities in the Visayas.^[15]
• November 16 – Autonomous Region in Muslim Mindanao is officially founded.

• December 19 – The military tribunal convicts 81 army personnel of mutiny in relation to the August 1987 coup attempt, giving them 12–20-year prison sentences at hard labor.^[16]

As per Executive Order No. 292, chapter 7 section 26, the following are regular holidays and special days, approved on July 25, 1987.^[17] Note that in the list, holidays in bold are "regular holidays" and those in italics are "nationwide special days".

• January 1 – New Year's Day
• April 9 – Araw ng Kagitingan (Day of Valor)
• April 12 – Maundy Thursday
• April 13 – Good Friday
• May 1 – Labor Day
• June 12 – Independence Day
• August 26 – National Heroes Day
• November 1 – All Saints Day
• November 30 – Bonifacio Day
• December 25 – Christmas Day
• December 30 – Rizal Day
• December 31 – Last Day of the Year

In addition, several other places observe local holidays, such as the foundation of their town. These are also "special days."

• September 22–October 7 – The Philippines participates in the 1990 Asian Games held in Beijing, China and it ranks 13th with one gold medal, two silver medals and seven bronze medals with an overall total of ten medals.