Leandro "Lean" Legara Alejandro (July 10, 1960 – September 19, 1987) was a student leader and left-wing nationalist political activist in the Philippines.

He also joined the Philippine Collegian, the UP student publication, as a features writer, where he wrote articles critical of the Marcos administration.

In 1985, the Bagong Alyansang Makabayan (BAYAN) was established, and Alejandro became its secretary-general leading the party together with retired senator Lorenzo M. Tañada.

Alejandro was a prominent member of the parliament of the streets during the 1980s, alongside Crispin Beltran, Lorenzo Tañada, and other Filipino nationalist leaders.

[8] After the People Power Revolution of 1986, Alejandro ran for Congress, standing unsuccessfully for the congressional seat of Malabon-Navotas against Tessie Aquino-Oreta, sister-in-law of President Corazon Aquino.

Alejandro was married to Lidy Nacpil, a fellow socialist activist he had met at the university through mutual membership of the United Methodist Youth Fellowship and the Student Christian Movement of the Philippines.

A documentary entitled Lean: In the Line of Fire is the Place of Honor was produced by Sandigan para sa Mag-aaral at Sambayanan (SAMASA) Alumni Association, the student political party under which Alejandro ran and won the chairmanship of the UP Diliman University Student Council in 1983.