British Forces

Force Q
   Rear Adm. C. H. J. Harcourt—Flag
CL  Aurora
CL Argonaut
CL Sirius
DD Quentin
DD Quiberon

Italian Forces

Escort Force

DD  Nicoloso da Recco
   Captain Aldo Cocchia—Flag
DD Folgore*
DD Camicia Nera
TB Clio
TB  Procione

Convoy H

KT-1 (7,800 tons)*   German
Aventino*                  Italian
Puccini*                    Italian
Aspromonte*            Italian

*Sunk

Sources:
1. The Chronology of the War at Sea 1939-1945 by J. Rohwer & G. Hummelchen
2. The Naval War in the Mediterranean 1940-1943  by J. Greene & A. Massignani
3. The Italian Navy in WWII by A. Bragadin.