Mataasnakahoy, officially the Municipality of Mataasnakahoy (Tagalog: Bayan ng Mataasnakahoy), is a 4th class municipality in the province of Batangas, Philippines. According to the 2020 census, it has a population of 30,621 people. It has 16 barangays and its total land area is 22.10 square kilometers (8.53 sq mi). It is bounded by Balete and Lipa City with Taal Lake on its western edge. The town is known for its cool climate due to its high elevation of 379 meters (1,243 ft).
Although the town's name is written as one word, it comes from the Tagalog phrase mataás na kahoy, which means "tall tree."It is explained in a May 1953 documented written by a commission composed of the town's schoolteachers. According to them, the name "mataas na kahoy" dates from 1862, when the Capitan Municipal of Lipa first decided to establishment the settlement in that particular place as a barrio of Lipa. The head of the settlement recalled a tall tree - literally "mataas na kahoy" - which was in their settlement, and named the new barrio after it.

Mataasnakahoy is originally a barrio of Lipa. Its present-day barangay Lumang Lipa was the second seat of Lipa in the 17th century before it was moved to Balete.

Mataasnakahoy was created as a municipality through Executive Order No. 308 signed by acting Governor General of the Philippines George C. Butte on March 27, 1931, effective January 1, 1932.

According to the Philippine Statistics Authority, the municipality has a land area of 22.10 square kilometers (8.53 sq mi) constituting 0.71% of the 3,119.75-square-kilometer (1,204.54 sq mi) total area of Batangas.

Mataasnakahoy is politically subdivided into 16 barangays.Each barangay consists of puroks and some have sitios.