Chow mein is a dish of Chinese stir-fried noodles with vegetables and sometimes meat or tofu. Over the centuries, variations of chǎomiàn were developed in many regions of China; there are several methods of frying the noodles and a range of toppings can be used. It was introduced in other countries by Chinese immigrants. The dish is popular throughout the Chinese diaspora and appears on the menus of most Chinese restaurants abroad. It is particularly popular in India, Nepal, the UK, and the US.

Noodles are a type of food made from unleavened dough which is either rolled flat and cut, stretched, or extruded, into long strips or strings. Noodles are a staple food in many cultures and made into a variety of shapes. The most common noodles are either those derived from Chinese cuisine or Italian cuisine.