Founded in 1920 with the name Baleares Foot-Ball Club after a merger of teams Mecánico FC and Mallorca FC, in 1942 it absorbed Athletic FC and added its name to the club.[2]
Atlético Baleares reached Tercera División – the lowest rank in the national leagues – in 1943, going on to remain in that level for the better part of the following three decades. In the early years of the '50s and '60s, however, it did manage four appearances in the Segunda División (1950–52, 1960–62), achieving two tenth-place finishes.
Since 1966, Atlético Baleares hosts the Trofeo Nicolás Brondo, the oldest summer tournament in the region. The hosts have won the competition – which was not held in 1976, 1988, 1990 and 2006, and consisted mostly of a single match – on 26 occasions.
García Gargallo, Manuel: Els origens de l'Atlètic Balears (1920-1942). Dels inicis a la fusió. Barcelona, 2013 Template:Ca icon
García Gargallo, Manuel: «El Atlético Baleares, patrimonio del fútbol balear (y mallorquín)». Cuadernos de Fútbol. Núm. 76 (May 2016). CIHEFE. ISSN 1989-6379 Template:Es icon
Salas Fuster, Antoni: L'Atlètic Baleares. Una història de supervivència. Palma: Ingrama SA (impr.), 2009. ISBN84-85932-78-1Template:Ca icon