Allied losses
MN Naiade (Sirène-class submarine), sunk by the MM Monzambano and Calatafimi off La Spezia (OTL scuttled in Toulon in 1942)
MN Aréthuse (Argonaute-class submarine), lost in the Gulf of Taranto to unknown causes (possible Italian mine) (OTL survived the war, decom.1946)
HMS Southampton (Town-class light cruiser), sunk by German Ju-87 bombers in the Strait of Sicily (OTL sunk in the same fashion earlier in January)
MN Georges-Leygues (La Galissonnière-class light cruiser), sunk by German Ju-87 and Ju-88 bombers off Corsica (OTL survived the war, decom. 1959)
MN Chevalier-Paul (Vauquelin-class destroyer), sunk by German Ju-87 and Ju-88 bombers off Corsica (OTL sunk off Beirut in June 1941)
MN Béarn (Béarn-class aircraft carrier), sunk by German Ju-87 and Ju-88 bombers off Solenzara (OTL survived the war, decom. 1967)
HMS Gallant (G-class destroyer), sunk by German Ju-87 and Ju-88 bombers in Malta (OTL beached in 1942, used as a blockshp in 1943)
MN La Pomone (La Melpomène-class torpedo boat), sunk by Italian MAS and German S-Boots in the Bouches de Bonifacio (OTL seized by the Italians then the Germans and sunk in September 1943)
MN La Flore (La Melpomène-class torpedo boat), sunk by Italian MAS and German S-Boots in the Bouches de Bonifacio (OTL survived the war in the FNFL, decom. 1950)
MN L'Iphigénie (La Melpomène-class torpedo boat), ran around after damage by Italian MAS and German S-Boots in the Bouches de Bonifacio (OTL seized by the Italians then the Germans and sunk by Italian MAS in September 1943)
Axis losses
KGM Wolf (Type 24-class torpedo boat), sunk by a British mine off Dunkirk as OTL
MM Naiade (Sirena-class submarine), sunk by the HMS Hasty and Hereward off Benghazi (OTL sunk in December 1940)
MM Glauco (Glauco-class submarine), sunk by a British patrol in the Strait of Gibraltar (OTL scuttled in June 1941)
MM Perla (Perla-class submarine), lost between Massawa and Bordeaux (OTL captured by the British, transferred to Greece, decom. 1954)
MM Leone (Leone-class destroyer), scuttled by the MAS-213 off Massawa (OTL beached in April 1941)
MM Cesare Battisti (Sauro-class destroyer), scuttled in Massawa Harbor (OTL scuttled in April 1941)
MM Daniele Manin (Sauro-class destroyer), sunk by British Swordfish off Port-Sudan (OTL sunk by air attack in April 1941)
MM Nazario Sauro (Sauro-class destroyer), ran aground off Port-Sudan due to bombing by British Swordfish (OTL sunk by air attack in April 1941)
MM Alberto di Giussano (Giussano-class light cruiser), sunk by the MN Chevalier-Paul and Dupleix during the Naval Battle of Calvi (OTL sunk during the Battle of Cape Bon)
MM Alberico da Barbiano (Giussano-class light cruiser), sunk by the MN Kersaint, Tartu, Vauquelin, Cassard and Chevalier-Paul during the Naval Battle of Calvi (OTL sunk during the Battle of Cape Bon)
MM Luca Tarigo (Navigatori-class destroyer), sunk by the MN Georges-Leygues and Montcalm during the Naval Battle of Calvi (OTL sunk by British destroyers in April 1941)
MM Ugolino Vivaldi (Navigatori-class destroyer), sunk by French Martin Maryland off Olbia (OTL scuttled in 1943)
MM Aldebaran (Spica-class torpedo boat), sunk by the MN Foch and Dunkerque during the Naval Battle of Solenzara (OTL mined in October 1941)
MM Altair (Spica-class torpedo boat), sunk by the MN La Galissonnière and Strasbourg during the Naval Battle of Solenzara (OTL mined in October 1941)
MM Canopo (Spica-class torpedo boat), sunk by the MN Marseillaise, Foch and Dupleix during the Naval Battle of Solenzara (OTL sunk by British bombers in May 1941)
MM Vega (Spica-class torpedo boat), sunk by the MN Strasbourg and La Galisonnière during the Naval Battle of Solenzara (OTL sunk by the HMS Hereward in January 1941)
MM Pleiadi (Spica-class torpedo boat), sunk by the MN Foch, Dupleix and Dunkerque during the Naval Battle of Solenzara (OTL sunk at Tripoli in October 1941)
MM Armando Diaz (Condottieri-class light cruiser), sunk by British destroyers and the MN Dupleix during the Battle of Cape Figari (OTL sunk by the HMS Upright in February 1941)
MM Alvise da Mosto (Navigatori-class destroyer), sunk by British destroyers and the MN Dupleix during the Battle of Cape Figari (OTL sunk by British cruisers in December 1941)
MM Baleno (Folgore-class destroyer), sunk by the MN Cassard and Vauquelin during the Battle of Cape Figari (OTL sunk off the Kerkennah, April 1941)