Maguindanaon (basa Magindanawn, Jawi: باس مڬندنون‎), or Magindanawn is an Austronesian language spoken by Maguindanaon people who form majority of the population of eponymous provinces of Maguindanao del Norte and Maguindanao del Sur in the Philippines. It is also spoken by sizable minorities in different parts of Mindanao such as the cities of Zamboanga, Davao, and General Santos, and the provinces of North Cotabato, Sultan Kudarat, South Cotabato, Sarangani, Zamboanga del Sur, Zamboanga Sibugay, Davao del Sur, as well as Metro Manila.

The Maguindanaon language is the native language of the Maguindanaon people of the province of Maguindanao located in the west of Mindanao island in the south of the Philippines. It was the language of the Sultanate of Maguindanao, which lasted until near the end of the Spanish colonial period in the late 19th century.

The earliest works on the language by a European were carried out by Jacinto Juanmartí, a Catalan priest of the Society of Jesus who worked in the Philippines in the second half of the 19th century.^[2][3] Aside from a number of Christian religious works in the language,^[5] Juanmartí also published a Maguindanao–Spanish/Spanish–Maguindanao dictionary and reference grammar in 1892.^[6] Shortly after sovereignty over the Philippines was transferred from Spain to the United States in 1898 as a result of the Spanish–American War, the American administration began publishing a number of works on the language in English, such as a brief primer and vocabulary in 1903,^[7] and a translation of Juanmartí's reference grammar into English in 1906.^[8]

A number of works about and in the language have since been published by Filipino and foreign authors.

Maguindanaon has 3 major dialects: Taw sa ilud, Taw sa laya, and Biwangen.

Maguindanaon dialects are:

• Ilud dialect: is spoken in Cotabato City, municipalities of Sultan Kudarat, Parang, Datu Odin Sinsuat, Upi, North Upi, Kabuntalan, Datu Piang, Datu Unsay, Shariff Aguak, Ampatuan, Mamasapano, Guindulungan, Sultan sa Barongis, Pagalungan, Pagagawan, Talitay and Talayan. From the province of North Cotabato, the municipalities of Pigcawayan, Libungan, Midsayap, Aleosan, Alamada, Banisilan, Carmen, Pikit, Midsayap, Kabacan, Matalam, Kidapawan and Mlang. The speech of the municipalities of Pikit, Matalam, Pagalungan and Pagagawan differs in pronunciation and intonation from the ilud dialect, but is similar in vocabulary.
• Laya dialect: is spoken in municipalities of Buluan, Datu Paglas, Salipada K. Pendatun, and Paglat, all in the province of Maguindanao, and Tulunan in the province of North Cotabato; the municipalities of Lambayong, Esperanza, Isulan, Senator Ninoy Aquino, Bagumbayan, Tacurong, President Quirino, Columbio and Lutayan, all in the province of Sultan Kudarat; the municipalities of Sto. Nino, Surallah, Norala, Banga, Lake Sebu, Koronadal, Tantangan, Polomolok, Tampakan and Tupi, all in the province of South Cotabato as well as some other parts of Davao City, Davao del Sur, Davao del Norte, Davao Oriental and Bukidnon.
• Biwangen dialect: is spoken in General Santos City, Sarangani Province, the coastal municipalities of Sultan Kudarat: Palimbang, Kalamansig and Lebak; the coastal municipalities in the province of Zamboanga del Sur, Zamboanga Sibugay some municipalities in Zamboanga del Norte and in Pagadian City.

Maguindanao is written with the Latin script, and used to be written with the Jawi script. Among works on the language published by Jacinto Juanmartí, his sacred history Compendio de historia universal contains Maguindanao texts in both Jawi and the Latin script.^[4]

• Languages of the Philippines
• Danao languages
• Maranao language
• Iranun language