The Leader of the Opposition in the Senate is the leader of the largest opposition group in the Senate of France. The status has no official recognition in the French Constitution. What is more, the ideological differences between groups in the Senate is smaller than as usual, as the powers of the Senate allow it, at best, to lengthen the time for a bill.

The Senate is the upper house of the French Parliament, with the lower house being the National Assembly, the two houses constituting the legislature of France. The French Senate is made up of 348 senators elected by part of the country's local councillors, as well as by representatives of French citizens living abroad. Senators have six-year terms, with half of the seats up for election every three years.