Ottavio Ridolfi (1582–1624) was a Roman Catholic cardinal.

On 21 Oct 1612, he was consecrated bishop by Giovanni Garzia Mellini, Cardinal-Priest of Santi Quattro Coronati, with Alessandro Ludovisi, Archbishop of Bologna, and Lorenzo Landi, Bishop of Fossombrone, serving as co-consecrators.

Episcopal succession While bishop, he was the principal co-consecrator of: Camillo Moro, Bishop of Termoli (1612); Luigi Capponi, Archbishop of Ravenna (1621); and Ludovico Ludovisi, Archbishop of Bologna (1621).

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