The angklung (Sundanese: ᮃᮀᮊᮣᮥᮀ) is a musical instrument from the Sundanese in Indonesia that is made of a varying number of bamboo tubes attached to a bamboo frame. The tubes are carved to produce a resonant pitch when struck and are tuned to octaves, similar to Western handbells. The base of the frame is held in one hand, while the other hand shakes the instrument, causing a repeating note to sound. Each performer in an angklung ensemble is typically responsible for just one pitch, sounding their individual angklung at the appropriate times to produce complete melodies (see Kotekan).

The angklung originated in what is now West Java and Banten provinces in Indonesia, and has been played by the Sundanese for many centuries. The angklung and its music have become an important part of the cultural identity of Sundanese communities. Playing the angklung as an orchestra requires cooperation and coordination, and is believed to promote the values of teamwork, mutual respect and social harmony.

On 18 November 2010, UNESCO included the Indonesian angklung in the Representative List of the Intangible Cultural Heritage of Humanity, and encouraged the Indonesian people and the Indonesian government to safeguard, transmit, promote performances and to encourage the craftsmanship of the angklung.

The word angklung may have originated from Sundanese angkleung-angkleungan, suggesting the movement of the angklung player and the onomatopoeic klung sound that comes from the instrument.

According to Dr. Groneman, the angklung had already been a favorite musical instrument of the entire archipelago even before the Hindu era. According to Jaap Kunst in Music in Java, besides West Java, angklung also exists in South Sumatra and Kalimantan. Lampung, East Java and Central Java are also familiar with the instrument.

In the Hindu period and the time of the Kingdom of Sunda, the instrument played an important role in ceremonies. The angklung was played to honor Dewi Sri, the goddess of Rice , so she would bless their land and lives. The angklung also signaled the time for prayers, and was said to have been played since the 7th century in the Kingdom of Sunda. In the Kingdom of Sunda, it provided martial music during the Battle of Bubat, as told in the Kidung Sunda. The oldest surviving angklung is the Angklung Gubrag, made in the 17th century in Jasinga, Bogor. Other antique angklung are stored in the Sri Baduga Museum, Bandung. The oldest angklung tradition is called angklung buhun ("ancient angklung") from Lebak Regency, Banten. The angklung buhun is an ancient type of angklung played by Baduy people of the inland Banten province during the seren taun harvest ceremony.

In 1938, Daeng Soetigna (Sutigna), from Bandung, created an angklung that is based on the diatonic scale instead of the traditional pélog or sléndro scales. Since then, the angklung has returned to popularity and is used for education and entertainment, and may even accompany Western instruments in an orchestra. One of the first performances of angklung in an orchestra was in 1955 during the Bandung Conference. In 1966 Udjo Ngalagena, a student of Daeng Soetigna, opened his Saung Angklung ("House of Angklung") as a centre for its preservation and development.

UNESCO included the Indonesian angklung in the Representative List of the Intangible Cultural Heritage of Humanity on 18 November 2010.