Giovanni Battista Castrucci (1541–1595) was a Roman Catholic cardinal.

Episcopal succession Episcopal succession of Giovanni Battista CastruccioWhile bishop, he was the principal consecrator of: Lelio Morelli, Bishop of Capaccio (1586); Antonio Maria Gallo, Bishop of Perugia (1586); Antonio Grimani (patriarch), Bishop of Torcello (1587); and Pietro Francesco Montorio, Bishop of Nicastro (1594).

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