NORTHERN IRELAND 1940-41
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Belfast Celtic FC 27 19 4 4 104 32 3,250 42
2 Portadown FC 27 17 4 6 92 58 1,586 38
3 Glentoran FC Belfast 28 16 5 7 99 57 1,737 37
4 Linfield FC Belfast 27 14 4 9 67 51 1,314 32
5 Distillery FC Belfast 28 13 5 10 77 57 1,351 31
6 Derry City FC Londonderry 28 8 3 17 48 100 0,480 19
7 Glenavon FC Lurgan 27 6 4 17 40 95 0,421 16
8 Cliftonville FC Belfast 28 2 1 25 40 117 0,342 5
  220 95 30 95 567 567   220
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Glenavon FC Lurgan vs Linfield FC Linfield & Portadown FC v Belfast Celtic FC not played
Portadown FC and Glenavon FC Lurgan resigned
Belfast = Béal Feirste Londonderry = Doire
Portadown = Port an Dúnáin Lurgan = an Lorgain
English = Irish
CUP
Semifinals Belfast Celtic FC - Glenavon FC Lurgan 5-2
Linfield FC Belfast - Distillery FC Belfast 5-2
Final (26.04.1941) Belfast Celtic FC - Linfield FC Belfast  1-0
NORTHERN IRELAND  1941-42
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Belfast Celtic FC 20 12 6 2 57 23 2,478 30
2 Linfield FC Belfast 20 11 7 2 64 38 1,684 29
3 Glentoran FC Belfast 20 11 3 6 59 37 1,595 25
4 Distillery FC Belfast 20 6 6 8 41 38 1,079 18
5 Derry City FC Londonderry 20 3 5 12 23 73 0,315 11
6 Cliftonville FC Belfast 20 2 3 15 29 64 0,453 7
  120 45 30 45 273 273   120
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Belfast = Béal Feirste Londonderry = Doire
English = Irish
CUP
Semifinals Ards FC Newtownards - Glentoran FC Belfast 0-2
Linfield FC Belfast - Distillery FC Belfast 6-0
Final (18.04.1942) Distillery FC Belfast - Glentoran FC Belfast 3-1
NORTHERN IRELAND 1942-43
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Linfield FC Belfast 20 14 2 4 55 26 2,115 30
2 Belfast Celtic FC 20 13 3 4 50 22 2,273 29
3 Distillery FC Belfast 20 10 2 8 42 34 1,235 22
4 Glentoran FC Belfast 20 7 2 11 54 56 0,964 16
5 Derry City FC Londonderry 20 6 3 11 32 51 0,627 15
6 Cliftonville FC Belfast 20 3 2 15 26 70 0,371 8
  120 53 14 53 259 259   120
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Belfast = Béal Feirste Londonderry = Doire
English = Irish
CUP
Semifinals Belfast Celtic FC - Larne FC 4-2
Glentoran FC Belfast - Ards FC Newtownards 4-2
Final (17.04.1943) Belfast Celtic FC - Glentoran FC Belfast  1-0
NORTHERN IRELAND 1943-44
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Belfast Celtic FC 19 12 5 2 55 21 2,619 29
2 Linfield FC Belfast 18 11 3 4 57 38 1,500 25
3 Distillery FC Belfast 20 10 3 7 52 47 1,106 23
4 Glentoran FC Belfast 20 8 1 11 49 50 0,980 17
5 Cliftonville FC Belfast 20 5 1 14 29 51 0,569 11
6 Derry City FC Londonderry 19 5 1 13 35 70 0,500 11
  116 51 14 51 277 277   116
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Linfield FC Belfast vs Belfast Celtic FC & Derry City FC Londonderry vs Linfield FC Belfast not played
Belfast = Béal Feirste Londonderry = Doire
English = Irish
CUP
Semifinals Belfast Celtic FC - Infantry Training 3-0
Linfield FC Belfast - Cliftonville FC Belfast 0-0 2-0
Final (17.04.1944) Belfast Celtic FC - Linfield FC Belfast  3-1
NORTHERN IRELAND 1944-45
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Linfield FC Belfast 20 15 4 1 81 24 3,375 34
2 Belfast Celtic FC 20 13 5 2 54 27 2,000 31
3 Derry City FC Londonderry 20 8 3 9 41 53 0,774 19
4 Distillery FC Belfast 20 8 1 11 44 58 0,759 17
5 Glentoran FC Belfast 20 7 1 12 55 67 0,821 15
6 Cliftonville FC Belfast 20 2 0 18 23 69 0,333 4
  120 53 14 53 298 298   120
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Belfast = Béal Feirste Londonderry = Doire
English = Irish
CUP
Semifinals Glentoran FC Belfast - Distillery FC Belfast 3-0
Linfield FC Belfast - Derry City FC Londonderry 4-0
Final (14.04.1945) Linfield FC Belfast - Glentoran FC Belfast 4-2
NORTHERN IRELAND 1945-46
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Linfield FC Belfast 20 17 0 3 79 27 2,926 34
2 Belfast Celtic FC 20 14 4 2 58 20 2,900 32
3 Distillery FC Belfast 20 7 5 8 47 52 0,904 19
4 Glentoran FC Belfast 20 5 6 9 46 58 0,793 16
5 Derry City FC Londonderry 20 5 1 14 48 72 0,667 11
6 Cliftonville FC Belfast 20 2 4 14 24 73 0,329 8
  120 50 20 50 302 302   120
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Admitted Coleraine FC, Ballymena United FC
Belfast = Béal Feirste Londonderry = Doire
English = Irish
CUP
Semifinals Distillery FC Belfast - Belfast Celtic FC II 0-0 1-0
Linfield FC Belfast - Belfast Celtic FC 2-0
Final (13.04.1946) Linfield FC Belfast - Distillery FC Belfast  3-0
NORTHERN IRELAND 1946-47
Northern Regional League
  Played Won Drew Lost For Against G/Av Points
1 Belfast Celtic FC 28 21 2 5 95 40 2,375 44
2 Glentoran FC Belfast 28 20 2 6 93 46 2,022 42
3 Linfield FC Belfast 28 20 1 7 93 45 2,067 41
4 Coleraine FC 28 10 5 13 54 75 0,720 25
5 Ballymena United FC 28 8 7 13 52 76 0,684 23
6 Distillery FC Belfast 28 9 2 17 59 69 0,855 20
7 Derry City FC Londonderry 28 9 2 17 53 80 0,663 20
8 Cliftonville FC Belfast 28 3 3 22 46 114 0,404 9
  224 100 24 100 545 545   224
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Admitted Glenavon FC Lurgan, Portadown FC, Ards FC Newtownards, Bangor FC
Belfast = Béal Feirste Ballymena = Baile Lifin
Coleraine = Cúil Raithin Londonderry = Doire
English = Irish
CUP
Semifinals Belfast Celtic FC - Linfield FC Belfast 1-0
Glentoran FC Belfast - Ballymena United FC 1-1 2-1
Final (26.04.1947) Belfast Celtic FC - Glentoran FC Belfast 1-0
NORTHERN IRELAND 1947-48
Irish League
  Played Won Drew Lost For Against G/Av Points
1 Belfast Celtic FC 22 19 1 2 84 26 3,231 39
2 Linfield FC Belfast 22 15 5 2 55 19 2,895 35
3 Ballymena United FC 22 10 7 5 52 38 1,368 27
4 Glentoran FC Belfast 22 9 8 5 44 29 1,517 26
5 Distillery FC Belfast 22 12 2 8 35 32 1,094 26
6 Coleraine FC 22 8 6 8 48 46 1,043 22
7 Glenavon FC Lurgan 22 8 6 8 45 45 1,000 22
8 Cliftonville FC Belfast 22 7 4 11 36 47 0,766 18
9 Ards FC Newtownards 22 7 4 11 37 54 0,685 18
10 Bangor FC 22 6 4 12 36 55 0,655 16
11 Portadown FC 22 3 3 16 31 60 0,517 9
12 Derry City FC Londonderry 22 2 2 18 18 70 0,257 6
  264 106 52 106 521 521   264
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Belfast = Béal Feirste Newtownards = Baile Nua na hArda
Ballymena = Baile Lifin Bangor = Beannchar
Coleraine = Cúil Raithin Portadown = Port an Dúnáin
Lurgan = an Lorgain Londonderry = Doire
English = Irish
CUP
Semifinals Coleraine FC - Belfast Celtic FC 3-3 3-2
Linfield FC Belfast - Glenavon FC Lurgan 5-1
Final (10.04.1948) Linfield FC Belfast - Coleraine FC 1-0
NORTHERN IRELAND 1948-49
Irish League
  Played Won Drew Lost For Against G/Av Points
1 Linfield FC Belfast 22 16 4 2 58 21 2,762 36
2 Belfast Celtic FC 22 14 3 5 69 32 2,156 31
3 Glentoran FC Belfast 22 13 3 6 45 28 1,607 29
4 Cliftonville FC Belfast 22 9 5 8 44 38 1,158 23
5 Bangor FC 22 8 5 9 43 45 0,956 21
6 Distillery FC Belfast 22 9 3 10 51 56 0,911 21
7 Portadown FC 22 8 4 10 41 48 0,854 20
8 Glenavon FC Lurgan 22 6 8 8 35 43 0,814 20
9 Derry City FC Londonderry 22 8 3 11 40 52 0,769 19
10 Ballymena United FC 22 6 7 9 39 58 0,672 19
11 Ards FC Newtownards 22 7 2 13 46 49 0,939 16
12 Coleraine FC 22 4 1 17 25 66 0,379 9
  264 108 48 108 536 536   264
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Belfast Celtic FC resigned and dissolved
Admitted Crusaders FC Belfast
Belfast = Béal Feirste Londonderry = Doire
Bangor = Beannchar Ballymena = Baile Lifin
Portadown = Port an Dúnáin Newtownards = Baile Nua na hArda
Lurgan = an Lorgain Coleraine = Cúil Raithin
English = Irish
CUP
Semifinals Derry City FC Londonderry - Distillery FC Belfast 2-0
Glentoran FC Belfast - Portadown FC 2-2 1-1 3-0
Final (16.04.1949) Derry City FC Londonderry - Glentoran FC Belfast 3-1
NORTHERN IRELAND 1949-50
Irish League
  Played Won Drew Lost For Against G/Av Points
1 Linfield FC Belfast 22 17 4 1 64 27 2,370 38
2 Glentoran FC Belfast 22 18 2 2 70 25 2,800 38
3 Distillery FC Belfast 22 13 3 6 48 31 1,548 29
4 Derry City FC Londonderry 22 12 5 5 44 29 1,517 29
5 Glenavon FC Lurgan 22 10 4 8 51 38 1,342 24
6 Ards FC Newtownards 22 7 6 9 34 38 0,895 20
7 Bangor FC 22 8 3 11 38 36 1,056 19
8 Portadown FC 22 3 9 10 33 52 0,635 15
9 Ballymena United FC 22 5 5 12 29 49 0,592 15
10 Coleraine FC 22 5 4 13 38 61 0,623 14
11 Crusaders FC Belfast 22 4 5 13 37 69 0,536 13
12 Cliftonville FC Belfast 22 3 4 15 34 65 0,523 10
  264 105 54 105 520 520   264
Rules for classification: 1) Points  (win 2 points, draw 1 point); 2) Goal average (play-off for relevant positions)
Play-off (Belfast 10.05.50)  Linfield FC Belfast - Glentoran FC Belfast   2-0    
Belfast = Béal Feirste Bangor = Beannchar
Londonderry = Doire Ballymena = Baile Lifin
Lurgan = an Lorgain Portadown = Port an Dúnáin
Newtownards = Baile Nua na hArda Coleraine = Cúil Raithin
English = Irish
CUP
Semifinals Distillery FC Belfast - Linfield Swifts FC Belfast 5-1
Linfield FC Belfast - Ballymena United FC 1-0
Final (22.04.1950) Linfield FC Belfast - Distillery FC Belfast  2-1