Club Atlético Unión may refer to:
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Unión de Mar del Plata
Club Atlético Unión de Mar del Plata is an Argentine sports club from Mar del Plata, Buenos Aires Province. The club was founded on December 1, 1926, and its main sports are football and basketball. In football, Unión currently plays in th ...
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Unión de Santa Fe
Club Atlético Unión (; mostly known as Unión de Santa Fe ) is a sports club from Santa Fe, the capital city of the Santa Fe Province, in Argentina. The club was founded on April 15, 1907 and plays in the Argentine Primera División.
Althou ...
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Unión de Sunchales
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