Lorenzo Martinez "Ka Tanny" Tañada Sr. CCLH (Tagalog: [tɐˈɲada], August 10, 1898 – May 28, 1992) was a Filipino statesman, lawyer, human and civil rights defender, and national athlete.

He is also equally renowned for his efforts to stop the continued presence of US military bases in the Philippines through the Anti-Bases Coalition (ABC).

Senator Tañada was also a co-founder of the Free Legal Assistance Group (FLAG) with Joker Arroyo and José W. Diokno.

The protest was prompted by the principal's order for school children to stay during weekends to build a playground, which prevented them from going home to their parents.

), Tañada, completed his Reserve Officers' Training Corps (ROTC) prior to the academic Philippine educational system and obtained the rank of major, and was a lead actor in plays.

's Armistice Day, he we would exhort "his fellow cadets to take their training seriously as they will soon be called upon to use their skill against the Americans if the country's independence is not granted".

In 1947, together with prominent justices and lawyers, they founded the MLQ Law School, which became the Manuel L. Quezon University in 1958 upon signing of the charter granted by the Ministry of Education, Sports and Culture.

Tañada served as the pre-war and first post-war solicitor general from 1940 to 1941 and 1945 to 1947,[6] tasked with the monumental collaboration cases against many prominent figures, where he earned the respect and admiration of many of his peers and countrymen.

[2] He was a petitioner in the landmark Supreme Court case Tañada vs. Tuvera, which declared that unpublished laws (a characteristic of the Presidential Decrees of Marcos) are without effect.

He was the organizer of the Anti-Bases Coalition (ABC) together with lawyer and former senator José W. Diokno and also led other groups that rallied public opposition to the presence of American troops in the Philippines.

He was a familiar fixture during the Martial law era of Ferdinand Marcos, leading rallies and demonstrations being the founding chairperson of Bagong Alyansang Makabayan.

However, JAJA could not unite the different competing groups and ideologies, and eventually former members left to form different alliances, with the largest being the Kongreso ng Mamamayang Pilipino (Congress of the Filipino People) or "KOMPIL", of which Tañada served as one of the chief delegates.

Tañada's name is inscribed on the Bantayog ng mga Bayani Wall of Remembrance, which recognizes heroes who fought against martial law in the Philippines under Ferdinand E.

; Taft Ave. to José W. Diokno Ave.; and Imelda Ave. to Sen. Geronima Pengson Ave. De La Salle University put up a special museum called the Lorenzo M. Tañada Memorabilia Room as a permanent part of the campus.

On 21 September 2021, he was honoured as Lasallian heroes against Martial Law along with Jose W. Diokno and Bishop Felix Paz Perez of Cavite.