S
- SB. Sydney to Corner Brook 1942-45 (reverse BS)
- SBF. Invasion Sicily Fast 1943
- SBS. Invasion Sicily Slow 1943
- SC. North America to UK, 1940-45 North Atlantic route (reverse ON(S), ONS)
- SD. Iceland to Clyde military (reverse DS)
- SD. Seychelles to Diego-Suarez 1944
- SG. Southend to Humber ("Grimsby")1940 (reverse GS)
- SG. Sydney to Greenland 1942-45 (reverse GS)
- SH. Sydney to Halifax (reverse HS)
- SHX. Sydney to HX convoys
- Silvertip. Newhaven to Dieppe
- SJ. San Juan to Guantanamo
- SJ. Singapore to Colombo 1941-42 (reverse JS)
- SJ. Santos to Rio de Janeiro
- SL. Freetown to UK
- SLF. Freetown to UK Fast
- SLS. Freetown to UK Slow
- SM. Batavia to Fremantle 1941-42
- SM. Naples to Marseilles 1944 (reverse MS)
- SN. Sydney to New Caledonia (reverse NS)
- SNF. Naples to North Africa ("Naples South") Troopships (reverse NSF)
- SQ. Sydney to Quebec (reverse QS)
- SR. Calcutta ("Sandheads") to Rangoon 1941-42
- SR. Freetown to Gibraltar 1943-44 (reverse RS)
- ST. Freetown to Takoradi (reverse TS)
- ST. Sydney to Townsville (reverse TS)
- STC. Freetown Takoradi Cape Town
- STL. Freetown Takoradi Lagos (reverse LS)
- STP. Freetown Takoradi Pointe Noire (reverse PTS)
- STW. Freetown Takoradi Walvis Bay (reverse WTS)
- SU. Suez to Australia 1940-41 (reverse US)
- SV. Sydney to Townsville (reverse VS)
- SW. Suez Mombasa Durban 1940-41
Read more about this topic: List Of World War II Convoy Codes