Tagalog may refer to:

• Tagalog language, a language spoken in the Philippines
  • Old Tagalog, an archaic form of the language
  • Batangas Tagalog, a dialect of the language
• Tagalog script, the writing system historically used for Tagalog, also known as Baybayin
  • Tagalog (Unicode block), character encodings for computers

• Tagalog people, a major ethnic group in the Philippines
• Southern Tagalog, a region in southern Luzon that is the heartland of the Tagalog people
• Tagalog Republic or Katagalugan, revolutionary governments during the Philippine Revolution
• Tagalog War, another name for the Philippine Revolution
• Tagalog (beetle), a genus of beetles in the subfamily Prioninae