February 23–March 7 – Mayon volcano in Albay erupts, with the most violent occurred, February 28 – March 1; its status is raised to the highest, Alert Level 5, on February 24 due to its hazardous explosions with pyroclastic and lahar flows that affected parts of the province, with several thousands evacuated even outside identified danger zones.[5]
March 16 – MILF rebels led by Commander Bravo attack and occupy Kauswagan, Lanao del Norte and later clash with Government troops, with more than 40 rebels, 9 soldiers and 2 civilians die in the fighting until the town is abandoned by the guerrillas and is retaken by the troops on March 18; the incident is one of the attacks occurred in several municipalities in the Lanao provinces.[8][14][15]
At least 69 people are killed when an unlicensed, overloaded wooden ferryboat ML Annahada heading for Tawi-Tawi and Malaysia capsized at sea after leaving a port in Jolo, Sulu, with more than a hundred others missing and feared dead.[12][28][29]
April 22 – Military troops launch an assault against Abu Sayyaf in Camp Abdurajak on Basilan Island, in response to a claim on Apr. 19 that the extremist Muslim rebel group have executed two male teachers, and in an attempt to rescue the hostages who have been held captive for a month; three soldiers and 25 rebels are reportedly killed in the attack; they capture the main rebel camp in the island on April 28.[18][19][34]
April 23 – ASG gunmen seized 21 people including 10 tourists and 11 resort workers, two of them Filipinos, from the resort island of Sipadan, Malaysia. Hostages are brought to the Jolo in the southern Philippines; most of them are released later that year except for a Filipino captive who would escape in 2003.[16][19][21][35][36][37]
Four ASG hostages, including a Roman Catholic priest and 3 teachers are killed during an operation which soldiers rescued 15 another hostages.[16][20][21][39] There are also reports that 5 children have been killed by the ASG and a female teacher has been missing; all among the victims who were kidnapped in March.[17][19]
Twenty-one soldiers and a CAFGU member are killed in an encounter between government troops and the MILF in Matanog, Maguindanao, in what would be the biggest single battle loss suffered by the government during the war.[8]
The ILOVEYOU computer virus, originating from the country, is released by a student, spreading quickly throughout the world and damaging around 45 million computers worldwide.[25][40]
A firefight between secessionist MILF and government soldiers occurs in the Lanao del Sur–Maguindanao provincial boundary, when rebels allegedly occupied a highway; ends with the capture of the MILF–BIAF headquarters on May 7, with 108 rebels and 3 Marine soldiers died within two days.[41]
May 6 – Six persons are killed and 37 others are wounded in separate bus explosions in Surigao and Butuan cities.[42]
May 7 – An Army Special Forces unit in Lantawan, Basilan, searching for ASG hostages taken in March, is ambushed by the bandits, killing 13 of its soldiers.[43][44]
A Philippine AirlinesFlight 812 is hijacked by a man, later identified as Augusto Lakandula, just before its landing at Manila. The suspect, who robbed passengers and attempted to jump out of the plane while in Antipolo, is found dead in a forest in Real, Quezon at night.[46]
Philippine peso closes to ₱43.40 per US dollar, the lowest since October 1998.[47]
July 1 – Televangelist Wilde Almeda and 11 other preachers from Jesus Miracle Crusade are abducted by ASG bandits as they went to a rebel camp in Jolo, Sulu. They are rescued on October 2 after being held hostage.[21][37][50]
July 16 – About a hundred armed men, suspected to be MILF rebels, attack a village in Bumbaran, Lanao del Sur, kill 21 Christian residents inside a mosque, and go on a shooting rampage that injures 11 people.[56]
August 11 – A clash between the government forces and a religious cult locally known as Tadtad in Pangantucan, Bukidnon results in deaths of at least 16 cult members and 4 from the troops.[60]
December 7 – Impeachment trial against Pres. Estrada begins at the Senate; the first for an Asian head of state. Its last day would be on January 16, 2001; trial aborted, Jan. 17.[66][69]
December 9 – Muñoz, Nueva Ecija becomes a city through ratification in a plebiscite of RA 8977 which was approved on November 7; the first Science City in the country and in Southeast Asia.[70]
As per Executive Order No. 292, chapter 7 section 26, the following are regular holidays and special days, approved on July 25, 1987.[79] Note that in the list, holidays in bold are "regular holidays" and those in italics are "nationwide special days".
January 31 – The Welcoat House Paints won the third straight PBL title in the 1999–2000 2nd Yakult-PBL Challenge Cup after beating Ana Water Dispenser in Finals Game 3, 58–56.
June 11 – The Alaska Milkmen won their third PBA All-Filipino crown in the last five years with a 4–1 series victory over Purefoods TJ Hotdogs. The title-conquest was their 10th championship.
June 27 – The Welcoat Paint Masters won their fourth straight title of the Philippine Basketball League after they beaten the Shark Energy Drink at the 2000 PBL Chairman's Cup held at Makati Coliseum.
August 6 – The 2000 ABC-PBA All-Star Game is the All-Star game was held on August 6, 2000, at the Philsports Arena in Pasig.
September 15–October 1 – The Philippines participated in the 2000 Summer Olympics in Sydney, Australia by sending a delegation of 20 members. But all of the athletes lost in the said event and did not home their medals.
September 15 – The San Miguel Beermen claim their 14th PBA crown by winning against Sta. Lucia Realtors in five games. The Realtors were on their first finals appearance since joining the league in 1993.
^On Feb. 17, a man with name Joey Filart is arrested in San Mariano, Isabela; but will later be ordered released by the Department of Justice; he is said to be the same individual mistakenly arrested but cleared in 1995.[2]
Accident as the Philippines' worst: —"RP's worst air accidents" (April 20, 2000). Philippine Daily Inquirer, p. 13. —Orosa, Rosalinda (July 25, 2014). "Philippines' worst commercial flight disasters". Philstar.com. Retrieved August 12, 2019.
^According to Aviation Safety Network database (Link), the said aviation accident is currently the worst. The worst before was the one which occurred in February 1998, now the 2nd deadliest, with 104 fatalities. (See the details of Feb. 1998 and Apr. 2000 accidents. Retrieved 02-11-2021.)