An acoustic panel comprises a mounting element and an acoustic damping element. The mounting element is adapted to be mounted to a wall or another structure of a building, and comprises a plurality of protrusions extending from a front side of the mounting element. The acoustic damping element comprises a rear face with a plurality of openings, and is adapted to be mounted to the mounting element with the plurality of protrusions fitting into the plurality of openings to hold the acoustic damping element in place at the mounting element. An acoustic panel system comprises a plurality of acoustic panels and a plurality of connecting brackets.