The Guêpe-class submarines were a planned class of submarines to be built for the French Navy ordered in 1904. Ten of the class were projected but only two were laid down before the whole project was cancelled. Construction of the two vessels that were laid down began in 1906, but it was stopped in 1908 before they could be completed.

Construction and specifications The Guêpe-class submarines, designed by Emmanuel Petithomme and built under French Minister of Marine Camille Pelletan's ministry, were solely intended for use in harbor defense.Domville-Fife, p. 77Sueter, p. 101 Although ten were projected, only two of the class were laid down in Cherbourg.Mason. p. 255 Neither of these were completed before Camille Pelletan was replaced as Minister of Marine and his successor cancelled their construction.Røksund, p. 216 The class-name, "guêpe", is French for wasp.

With a single-hull design, the Guêpe-class submarines were planned to have a surfaced displacement of 44 tons, and were in length, with a beam of . If built, the Guêpe submarines would have been powered by one Schneider diesel engine driving a single shaft, which would have provided a top speed of when surfaced and when submerged. Each vessel would have had a range of at , while surfaced, and at when submerged, and had a crew of seven. Guêpe-class submarines had a maximum depth of . The vessels' armament would have consisted solely of two Drzewiecki drop collar torpedo launchers.

Boats Ordered in 1904, Guêpe 1 and Guêpe 2 were laid down in 1906 at the Cherbourg Naval Base. Eight more boats, Guêpe 3 to 10, were planned to be built in Cherbourg, Rochefort, and Brest. Only the first two submarines were ordered on 8 October 1904 and laid down. Construction stopped in March 1908. The pennant numbers Q 51 to 58, reserved for Guêpe 3 to Guêpe 10, were assigned the following year to Pluviôse-class submarines.

Guêpe-class submarines Name Ordered Laid down Fate Guêpe 1 1904 1906 Construction stopped in 1908 Guêpe 2 Construction stopped in 1908 Guêpe 3 Cancelled in 1908 Guêpe 4 Cancelled in 1908 Guêpe 5 Cancelled in 1908 Guêpe 6 Cancelled in 1908 Guêpe 7 Cancelled in 1908 Guêpe 8 Cancelled in 1908 Guêpe 9 Cancelled in 1908 Guêpe 10 Cancelled in 1908

See also List of submarines of France

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