The bonang is an Indonesian musical instrument used in the Javanese gamelan. It consists of small gongs, sometimes called "kettles" or "pots," arranged horizontally on strings in a wooden frame called a rancak. These gongs are placed in one or two rows. Each kettle has a central boss. The lower-pitched gongs have a flattened top, while the higher-pitched ones have a curved top. Each kettle is tuned to a specific pitch in either the pelog or slendro scale, so there are different bonang for each scale. They are usually struck with padded sticks called tabuh. This is similar to other gongs in the gamelan, such as the kethuk, kempyang, and kenong. Bonang can be made of forged bronze, welded and cold-hammered iron, or a mix of metals. Some bonang use hammered iron or brass plates with raised bosses, and these are often found in village gamelan, Suriname-style gamelan, and some American gamelan. In central Javanese gamelan, there are three types of bonang:

The bonang barung and bonang panerus play more complex parts than many other gamelan instruments. These are considered elaborating instruments. They sometimes play melodies based on the balungan, though these melodies are usually simplified. They can also play more complex patterns by combining barung and panerus parts, such as alternating interlocking sections (imbal) or adding detailed melodic patterns (sekaran).

The kolenang, a type of bonang with a single row of gongs arranged in a V or U shape, is a key melodic instrument in the Sundanese Gamelan degung.

The bonang is similar to the Balinese reong and the single-row kulintang found in the southern Philippines and Borneo.