Viribus contractis - With gathering strength
Disbanded 28th March 1945
Known Codes : , LD, MF,

Nunquam domandi - Never to be tamed
Disbanded 10th May 1957
Known Codes : , VA,

Caedimus noctu - We slay by night
Disbanded 31st March 1964
Known Codes : , TW,

Vincere est vivere - To conquer is to live
Disbanded 25th May 1945
Known Codes : , NE, HO,

Who shall stop us
Disbanded 23rd August 1963
Known Codes : , PL, NV,

Noctividus - Seeing by night
Disbanded 2nd July 1958
Known Codes : , P4, TB,

Excellere contende - Strive to excel
Known Codes : , YB, UT, UV,

Nocte custodimus - We keep the night watch
Disbanded 31st May 1946

Facta non verba - Deeds not words
As a result of 2010 defence cuts, 20 Squadron disbanded on 31 March 2010, with its tasks taken over by the retitled 4 (Reserve) Squadron.
Known Codes : , HN, 6D, PM, TH,

Woe to the unwary
Disbanded 13th November 1959
Known Codes : , MW, YQ,

From dusk till dawn
Disbanded 31st July 1957
Known Codes : , FK, OZ,

Jaculamur humi - We strike them to the ground
Disbanded 10th July 1945
Known Codes : , LA, VV,

Speculati nuntiate - Having watched, bring word
Disbanded 25th May 1945
Known Codes : , FA, MB, ND,

Exploramus - We seek out
Disbanded 1st July 1945
Known Codes : , HB,

Il faut en finir - It is necessary to make an end of it
Disbanded 30th September 1946
Known Codes : , RK, DM, WR,

Feriens Tego - Striking I defend
Known Codes : , ZK, RX,

With or on
Disbanded 1st December 1946
Known Codes : , BT, PN,

Fljua vakta ok ljosta - To fly, to watch and to strike
Disbanded 23rd June 1963
Known Codes : , QM,

Ad auroram - To the break of dawn
Disbanded 30th April 1946
Known Codes : , YD,