Traditional Filipino formal men's shirt.

Tagalog (According to the OED and Merriam-Webster Online Dictionary ; Baybayin: ) is an Austronesian language spoken as a first language by the ethnic Tagalog people, who make up a quarter of the population of the Philippines, and as a second language by the majority, mostly as or through Filipino.

The ancient or older medieval language of Tagalog mostly spoken and sparsely written using the Baybayin script in the Philippines from around its split off from other Central Philippine languages to around 1565 C.E., when it soon developed into Classical Tagalog after Christianization by the Spanish arrival. It developed from Central Philippine, under Greater Central Philippine, under Proto-Philippine, with influence from Old Malay, Classical Sanskrit, Classical Arabic, Middle Tamil, Classical Persian, Old Javanese, and either or both Medieval Min Chinese and/or Late Middle Chinese.

an Austronesian ethnic group native to the Philippines, particularly the Metro Manila and Calabarzon regions and Marinduque province of southern Luzon, and comprise the majority in the provinces of Bulacan, Bataan, Nueva Ecija, Aurora, and Zambales in Central Luzon and the island of Mindoro.

Tagalog profanity can refer to a wide range of offensive, blasphemous, and taboo words or expressions in the Tagalog language of the Philippines.

(Tagalog: Balarilà ng Tagalog) the rules that describe the structure of expressions in the Tagalog language, one of the languages in the Philippines.

This article deals with current phonology and phonetics and with historical developments of the phonology of the Tagalog language, including variants.

(also known as Batangan or Batangueño ) a dialect of the Tagalog language spoken primarily in the province of Batangas and in portions of Cavite, Quezon, Laguna and on the island of Mindoro.

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.

Southern Tagalog, designated as Region IV, was an administrative region in the Philippines that comprised the current regions of Calabarzon and Mimaropa, the province of Aurora in Central Luzon, and most of the National Capital Region.

The Southern Tagalog Arterial Road, commonly known as the STAR Tollway, is a two-to-four-lane controlled-access toll expressway in the province of Batangas in the Philippines.