'Broadarrow' was an Allied naval deception undertaking designed to deter Axis submarine operations in the Mediterranean Sea by exaggerating the strength of the Allied anti-submarine forces (January 1943).

The operation was effected by means of a Greek double agent, and added a notional five ships to the Allies' actual anti-submarine strength. The undertaking lasted for only a short time as the arrival of additional Allied ships quickly rendered the deception redundant.