Aero is an aerated chocolate bar manufactured by the Vevey-based company Nestlé. Originally produced by Rowntree's, Aero bars were introduced in 1935 to the North of England as the "new chocolate". By the end of that year, it had proved sufficiently popular with consumers that sales were extended throughout the United Kingdom.

Nestlé S.A. is a Swiss multinational food and drink processing conglomerate corporation headquartered in Vevey, Switzerland. It has been the largest publicly held food company in the world, measured by revenue and other metrics, since 2014. It ranked No. 64 on the Fortune Global 500 in 2017. In 2023, the company was ranked 50th in the Forbes Global 2000.