Teodoro Plata (died February 6, 1897) was a Filipino patriot who was among those who founded the Katipunan that sparked the Philippine Revolution against Spain in 1896.
He met Andres Bonifacio at a boarding house in Manila along with Ladislao Diwa who was then a law student at the University of Santo Tomas. Bonifacio, Diwa and Plata were all freemasons who were inspired by the nationalistic objectives of the Propaganda Movement in Europe.
Plata was a member of La Liga Filipina, which was founded by Jose Rizal to push for reforms in the Spanish colonial administration. But he agreed with Bonifacio and Diwa who believed that the time was ripe for an armed uprising against Spain.
On July 6, 1892, upon learning of Rizal's deportation to Dapitan in Mindanao, Plata, Bonifacio and Diwa decided to form a secret society to prepare for a revolution against Spain. The following day, they met with their friends and fellow freemasons Deodato Arellano, Valentin Diaz and Jose Dizon at a house in Tondo and established the Katipunan.
In 1892, he served as the secretary of the secret society with Arellano as president, Bonifacio as comptroller, Diwa as fiscal, and Diaz as treasurer.
In 1893, under the presidency of Roman Basa, Plata served as councilor and it was at this time that the society organized a women's auxiliary section. One of its first members was Plata's cousin Gregoria de Jesus, who wrote in her autobiography that Plata was Bonifacio's constant companion when he would call at their house in Caloocan to court her.