Alitagtag, officially the Municipality of Alitagtag (Tagalog: Bayan ng Alitagtag), is a municipality in the province of Batangas, Philippines. According to the 2024 census, it has a population of 28,033 people.

Alitagtag derived its name from the Tagalog word alinagnag, which means "a small distinct light."

Much of Alitagtag was once part of Bauan. On August 10, 1908, the resolution by the electorate of barrios Alitagtag, Balagbag, Dalipit, Munlawin, and Muzon was transmitted to the Provincial Committee, who would approve it in three months' time. Batangas Governor Galicano Apacible later endorsed it to the Civil Commission for a hearing that would be held on January 2, 1909.

The aforementioned barrios were separated from Bauan to constitute the new independent municipality of Alitagtag by virtue of Executive Order No. 43 dated May 7, 1909. The order took effect on January 1, 1910.

In 1957, the following barrios were created: Pingas, composed of sitios Pingas and Corral; Tadlak, composed of sitios Tadlak and Malukan; and Sambi, composed of the sitio Sambi.

According to the Philippine Statistics Authority, the municipality has a land area of 24.76 square kilometers (9.56 sq mi)  constituting 0.79% of the 3,119.75-square-kilometer (1,204.54 sq mi) total area of Batangas.

It is bordered on the north by Taal Lake, east by Cuenca and San Jose, west by Santa Teresita and San Luis, and south by Bauan and San Pascual.

Alitagtag is politically subdivided into 19 barangays, as shown in the matrix below. Each barangay consists of puroks and some have sitios.