A gyppo or gypo logger is a logger who runs or works for a small-scale logging operation that is independent from an established sawmill or lumber company. The gyppo system is one of two main patterns of historical organization of logging labor in the Pacific Northwest United States, the other being the "company logger".
Gyppo loggers were originally condemned by the Industrial Workers of the World (IWW) as strikebreakers. After the founding of a government-sponsored company union, the Loyal Legion of Loggers and Lumbermen, weakened the influence of the IWW on the logging industry, attitudes towards gyppos changed, and they came to be seen by the victorious bosses and scabs as a normal component of the timber business in a less ideologically charged context.