Tagalog Republic (; ) is a term used to refer to two revolutionary governments involved in the Philippine Revolution against the Spanish Empire and the Philippine–American War. Both were connected to the Katipunan revolutionary movement.

Etymology

The term Tagalog commonly refers to both an ethno-linguistic group in the Philippines and their language. Katagalugan often refers to the Tagalog-speaking regions of the island of Luzon in the Philippine archipelago.

However, the Katipunan secret society extended the meaning of these terms to all of the natives in the Philippine islands. The society's primer explains its use of Tagalog in a footnote:

{| class=wikitable

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! scope="col" | Original writing

! scope="col" | Modern Manila Tagalog translation

! scope="col" | English translation

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|Sa salitáng tagalog katutura’y ang lahát nang tumubo sa Sangkapuluáng itó; sa makatuid, bisaya man, iloko man, kapangpangan man, etc., ay tagalog din.

|Ang salitang Tagalog ay tumutukoy sa lahat ng ipinanganak sa kapuluang ito; samakatuwid, Bisaya man, Ilokano man, Kapampangan man, etc. ay Tagalog din.

|The word Tagalog refers to all of those born in this archipelago; therefore, even Visayans, Ilocanos, Kapampangans, etc. are also Tagalogs.

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The revolutionary Carlos Ronquillo wrote in his memoirs: The American historian John R. M. Taylor, custodian of the Philippine Insurgent Records, wrote:

Milagros C. Guerrero and others have described Bonifacio as "effectively" the commander-in-chief of the revolutionaries. They assert: