Kalibo, officially the Municipality of Kalibo (Aklanon: Banwa it Kalibo; Hiligaynon: Banwa sang Kalibo; Tagalog: Bayan ng Kalibo), is a municipality and capital of the Province of Aklan, Philippines. According to the 2024 census, it has a population of 93,218 people.

Kalibo is located in the north-west of Panay island and also, it is the most populous town in Aklan. It is the main transportation hub for the resort island of Boracay. The municipality is known for the Ati-Atihan festival; the semi-urban and multi-awarded mangrove forest Bakhawan Eco-Park and piña-weaving, which was inscribed to the UNESCO Intangible Cultural Heritage List in 2023.

The term Kalibo comes from the Aklanon word sangkâ líbo, ("one thousand"), reputedly the number of native Ati who attended the first Catholic Mass celebrated there. Kalibo was originally spelled as Calivo.

The town of Kalibo was originally called Akean by the inhabitants, similar to the name of the river nearby. The word akean itself connotes the warbling of running waters, from the root word akae, meaning "to boil". Akae-akae means "to bubble" or "to boil" or "to make the sound of bubbling or boiling" in the Aklanon language.

The Spaniards interchanged the names Aklan and Calivo to refer to the town. Aside from these two, other names such as Calibo, Daclan, Adan, and Calibog have been used.

When Miguel López de Legazpi arrived in 1569, he discovered that the town already had around 2,000 inhabitants, so he recruited 500 of them to help conquer the rest of the Philippines. On November 3, 1571, it became an encomienda and on April 22, 1581, the town became a parish under the Augustinians. During the Spanish era, Kalibo was part of Capiz.

On March 17, 1897, Filipino revolutionaries march to Kalibo but lost the battle against the Spaniards. Some of them escaped to the jungle.

On March 23, 1897, the Nineteen Martyrs of Aklan were executed by the Spanish colonial government for their role in the Philippine Revolution.