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This is a list of the longest rivers on Earth. It includes river systems over 1,000 kilometres (620 mi).

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Among the longest rivers of Canada are 47 streams of at least 600 km (370 mi). In the case of some rivers such as the Columbia, the length listed in the table below is solely that of the main stem. In the case of others such as the Mackenzie, it is the combined lengths of the main stem and one or more upstream tributaries, as noted. Excluded from the list are rivers such as the Dauphin, a short connecting link between lakes Manitoba and Winnipeg, with main stems of 100 km (62 mi) or less. Also excluded are rivers such as the Mississippi, the main stems of which do not enter Canada even though some of their tributaries do.

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This is a list of the longest rivers on Earth. It includes river systems over 1,000 kilometres (620 mi).

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Among the longest rivers of Mexico are 26 streams of at least 250 km (160 mi). In the case of rivers such as the Colorado, the length listed in the table below is solely that of the main stem. In the case of the Grijalva and Usumacinta, it is the combined lengths of two river systems that share a delta. In the case of the Nazas and Aguanaval, it is the combined lengths of separate rivers that flow into the same closed basin.

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This is a list of the major rivers that flow through Ukraine.

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This is a list of the longest rivers of the United Kingdom.

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The main stems of 38 rivers in the United States are at least 500 miles (800 km) long. The main stem is "the primary downstream segment of a river, as contrasted to its tributaries". The United States Geological Survey (USGS) defines a main-stem segment by listing coordinates for its two end points, called the source and the mouth. Some well-known rivers like the Atchafalaya, Willamette, and Susquehanna are not included in this list because their main stems are shorter than 500 miles.