Castel Guelfo di Bologna (Eastern Bolognese: Castèl Guêlf or Castelghèif) is a comune (municipality) in the Metropolitan City of Bologna in the Italian region Emilia-Romagna, located about 30 kilometres (19 mi) southeast of Bologna.

Castel Guelfo di Bologna borders the following municipalities: Castel San Pietro Terme, Dozza, Imola, Medicina.

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