During the French Revolution, a constitutional bishop was a Roman Catholic bishop elected from among the clergy who had sworn to uphold the Civil Constitution of the Clergy between 1791 and 1801. Constitutional bishops were often priests with less or more moderate Gallican and partisan ideas, of a less or moderate nature. They were elected locally by the same body of electors that elected the députés of the future Legislative Assembly. They organised national councils in 1797 and 1801 to mark their independence from the pope, who usually called such councils. On the signature of the 1801 concordat, pope Pius VII and Napoleon I of France both demanded that the constitutional bishops and the remaining Ancien Régime bishops who had not sworn to uphold the Civil Constitution all resign their episcopal seats so that new holders could be appointed to the sees. 15 constitutional bishops refused to resign, feeling that their election to their episcopal seats were still valid (one such bishop, Henri Grégoire, signed himself as bishop of Loir-et-Cher right up until his death).

The Civil Constitution of the Clergy was a law passed on 12 July 1790 during the French Revolution, that subordinated the Roman Catholic Church in France to the French government.