The Chevrolet Aveo (/əˈveɪ.oʊ/ ə-VAY-oh) is a five-seat, front-wheel drive subcompact car (B-segment) marketed by General Motors (GM) since 2002 over two generations. Originally developed by South Korean manufacturer Daewoo Motors and marketed as the Daewoo Kalos (Korean: 대우 칼로스), the takeover of Daewoo by GM to form GM Daewoo Auto & Technology (GMDAT) resulted in the car's marketing in 120 countries under seven brands (Chevrolet, Daewoo, ZAZ, Holden, Pontiac, Ravon and Suzuki) — prominently as the Chevrolet Aveo.

The second-generation Aveo, developed by GM Korea (formerly GMDAT), was introduced in 2011 and was also marketed as the Chevrolet Sonic in markets including the Americas, Japan, Middle East, South Africa and several Southeast Asian markets. Production of the second-generation model ended in October 2020.

Since 2017, GM marketed the Chinese market Chevrolet Sail sedan in Mexico and other Central American countries as the Aveo. Developed by GM PATAC in China and produced by joint venture SAIC-GM, it was positioned below the more advanced Sonic. In 2023, GM introduced a new generation to Mexico and Central America in a sedan and hatchback form, developed and manufactured by another Chinese joint venture, SAIC-GM-Wuling.

GM Daewoo introduced the Daewoo Kalos in September 2002, based on a new platform, replacing the Daewoo Lanos (T100). Under development before Daewoo's bankruptcy, the Kalos was the company's first new model introduction following its subsequent takeover by General Motors. Manufacture of the Kalos began in early March 2002, with pre-production prototypes shown at the Geneva Auto Show in April 2002. The nameplate Kalos derives from the Greek word καλός (kalós) for "beautiful" and "good".

Originally designed by Italdesign, the Kalos derives directly from the "Kalos Dream" concept vehicle first presented at the 2000 Paris Motor Show and subsequent developmental concepts at the 2001 Frankfurt Motor Show, 2002 Geneva Motor Show, and 2003 Geneva Motor Show. During this three-year development period Daewoo was struggling financially.

The Kalos was sold in three and four available body styles: a 4-door sedan and 5-door hatchback from the beginning of production in 2002, and a 3-door hatchback available in certain European markets beginning in 2005. Two different T200 front-end styling designs were sold. When released in 2002, the T200 headlamps were detached from the horizontal amber turn signal strip, located directly below. This detached style, used primarily in South Korea and North America, was used in conjunction with a semi-elliptical grille. When sales in Europe began in 2003, the headlights were an integrated unit that slanted upwards from the "V-shaped" grille towards the front fenders. In Australia, when the Daewoo Kalos was introduced in 2003, the hatchback featured the integrated lighting arrangement, with the detached style used to differentiate the sedans. In South Korea, where the detached lights were used at first, the integrated design was later utilized as a facelift.

The T200 sedan and five-door hatchback featured a swage line running along the lower body to the rear door, which kinked downward prominently on the five-door. The Five-door model also featured a side window sill that angled up sharply at the C/D pillar. Interiors featured a circular motif.

GM introduced the heavily facelifted sedan at the 2005 Auto Shanghai, designed in cooperation with PATAC. Bearing the internal code T250 and marketed in South Korea as the Daewoo Gentra, revisions included exterior styling changes, a new interior instrument panel and minor equipment changes, including increased sound deadening. Incorporation of the radio antenna into the rear glass and extensive wind tunnel testing helped reduce the coefficient of drag from 0.348 to 0.326.