1971 Chevrolet C10

C/K is a series of trucks that were manufactured by General Motors. Marketed under the Chevrolet and GMC brands, the C/K series included a wide range of vehicles. While most commonly associated with pickup trucks, the model line also included medium-duty and heavy trucks. "C" denoted a two-wheel drive; "K" denoted four-wheel drive.

Introduced for the 1960 model year, the C/K series was marketed by Chevrolet until 2002 in the United States (GMC marketed the series from 1960 to 1987). In South America, the C/K was marketed by Chevrolet from 1964 to 2001 in Brazil and from 1975 to 1982 in Chile. After 1989, GM ended the use of the C/K series for medium-duty trucks, replaced by the Chevrolet Kodiak/GMC TopKick.

The C/K series was produced across four generations, introduced in 1960, 1967, 1973, and 1988. In contrast to Chevrolet, GMC marketed only the first three generations as the C/K, with the fourth generation becoming the GMC Sierra. Introduced in 1999, the Chevrolet Silverado became the divisional replacement for the C/K; the Silverado and Sierra drew their nameplates from top-level trims in use since the 1970s.