Benigno Aquino Jr. (November 27, 1932–August 21, 1983), more popularly known by his nickname, Ninoy, was a leading opposition politician in the Philippines during the dictatorship of President Ferdinand Marcos. He was assassinated at the Manila International Airport on returning home from exile, and widow Corazon Aquino became the focus of the opposition and eventually replaced Marcos as president.

Born in Concepción in Tarlac province, he became mayor of the town in 1955 at the age of only 22. In the same year he married Corazón Cojuangco . He became governor of Tarlac in 1961, secretary-general of the Liberal Party in 1966, and a senator in 1967. When President Marcos declared martial law in 1972 Aquino was imprisoned on charges of murder and subversion. He was sentenced to death in 1977. This was commuted into exile to allow medical treatment in the United States in 1980.

On August 21, 1983 he returned to the Philippines. He wished to return to suffer alongside his people and to appeal directly to Marcos to step down and seek a peaceful regime change and reformation. In his prepared speech, Ninoy wrote:

"I have returned on my free will to join the ranks of those struggling to restore our rights and freedoms through non-violence.

I seek no confrontation. I only pray and will strive for a genuine national reconciliation founded on justice.

I am prepared for the worst, and have decided against the advice of my mother, my spiritual adviser, many of my tested friends and a few of my most valued political mentors...

I could have opted to seek political asylum in America, but I feel it is my duty, as it is the duty of every Filipino, to suffer with his people especially in time of crisis. I never sought nor have I been given any assurances, or promise of leniency by the regime.

I return voluntarily armed only with a clear conscience and fortified in the faith that in the end, justice will emerge triumphant. According to Gandhi, the willing sacrifice of the innocent is the most powerful answer to insolent tyranny that has yet been conceived by God and man...

I return from exile and an uncertain future with only determination and faith to offer – faith in our people and faith in God."

Despite the presence of his own security guards and government troops on the tarmac, he was presumably gunned down by Rolando Galman , who was immediately shot dead by troops. It was never officially established why or if Galman had done it, though many suspected that Galman was just a fall guy. Even more suspicions arose on who ordered the assassination. Everyone from the CIA to the Communist Party of the Philippines to First Lady Imelda Marcos was accused of having conspired for the hit. It must also be noted that President Marcos was gravely ill and in very poor shape during this time, as he was at the National Kidney and Transplant Institute recovering from his kidney transplant on August 7 when this incident occurred—he was in no shape to run the government. Conspiracy theories arose as to who was in charge and who ordered the hit when Marcos was in his sickbed recuperating. President Marcos then ordered an independent body, the Agrava Commission, to investigate the assassination. High-ranking military officials were indicted, including Gen. Fabian Ver, the Armed Forces Chief and known as Marcos's enforcer, but were soon acquitted. The military team on the tarmac at the time are currently serving life sentences at Bilibid Prison . They have filed a recent appeal to have the sentences reduced after 22 years, claiming that the assassination was ordered by Danding Cojuangco Marcos crony and Corazon Aquino's cousin.

His funeral procession on August 31 lasted 12 hours, from 9 am, when a funeral mass attended by the Catholic Archbishop in the country, Jaime Cardinal Sin, was held in Sto. Domingo Church, to 9 pm, when he was interred in the Manila Memorial Park. Two million people lined the streets during the procession, and millions more listened on the Church-sponsored Veritas radio station, the only station that dared to cover the procession.

The assassination of Ninoy transformed the opposition movement overnight from a small isolated movement to a mass movement involving people across all classes of society in Metro Manila. The middle class was involved, the lower class was involved, and business leaders whom Marcos irked during martial law supported the movement. The assassination showed the increasing incapacity of the Marcos regime—Ferdinand was mortally ill when the assassination occurred while his cronies mismanaged the country in his absence—and outraged Aquino's supporters that he would allow the assassination of a key figure of the opposition to happen. The mass discord caused by the assassination put the Philippines on the map for the United States. Attention was brought to the Philippine Crisis, and exposes on Imelda’s extravagant lifestyle and “mining operations”, as well as Ferdinand’s dictatorial excesses emerged. US President Ronald Reagan became fearful of a full scale, destabilizing and bloody revolution that could only spell disaster for US interests in the Philippines, as well as the regional stability. Reagan would denounce the assassination—but never to renounce his friend Marcos.

The assassination also thrust Ninoy's widow, Cory into the popular eye. Cory Aquino went on to campaign furiously in the 1986 snap elections called by Marcos to satiate public discontent with his regime. On the 57 days of campaigning before the February 7, 1986 election, Aquino’s UNIDO party took to the roads, visiting all but a few of the Philippine provinces. On the campaign trail, Aquino was greeted by throngs of people throwing confetti and cheering her on, “Cory! Cory! Cory!”. Despite Marcos' declaration that he had won the election, Cory and her supporters refused to accept this fraudulent outcome, prompting the People Power revolution that drove Marcos into exile and placed Cory in power as President.

“The Filipino is worth dying for.” —Ninoy Aquino

In Ninoy's honor, the Manila International Airport has been renamed as the Ninoy Aquino International Airport (NAIA) and his image is printed on the 500-peso bill.

His son, Benigno Aquino III, is a congressman representing the 1st district of Tarlac and his daughter, Kris Aquino, is a TV and movie actress.