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The Destroyer Squadron - based in Galway, Connacht (Haulbowline after May 1937)
First Division - Commander Edward S.F. Fegen
- LÉ Connacht (S1)
Second Division - Not assigned, not yet active
- LÉ Contae Dhún na nGall (S5) (County Donegal)
- LÉ Contae Laoise (S6) (County Laois)
- LÉ Contae Loch Garman (S7) (County Wexford)
- LÉ Contae an Chabháin (S8) (County Cavan)

The Minesweeper Squadron - based in Galway, Connacht
First Minesweeper Division - Leifteanant-Cheannasaí Jack Byrne
- LÉ Aisling (SF-1)
- LÉ Emer (SF-2)
Second Minesweeper Division - Leifteanant-Cheannasaí Joseph MacNamara
- LÉ Fola (SF-3)
- LÉ Banba (SF-4)

The Torpedo Boat Squadron - based in Galway, Connacht - Leifteanant Gilroy Cunningham
- LÉ M1 (MTB-1)
- LÉ M2 (MTB-2)

The Training Squadron - based in Galway, Connacht
- LÉ Muirchu (BGM-1)

The Support Squadron - based in Galway, Connacht - Leifteanant Timothy Finnegan
- LÉ Bres (YTB-1)
- LÉ Nuada (YTB-1)

The Patrol Squadron - based in Galway, Connacht (operated under Department of Fisheries control with INS crews) - Cheannasaí Hugh Kennedy
- LÉ Deirdre (BGM-2)
- LÉ Eithne (BGM-3)
- LÉ Grainne (BGM-4)
- LÉ Niamh (BGM-5)

The Destroyer Squadron - based in Haulbowline, Munster - Captaen Edward S.F. Fegen
First Division - Captaen Edward S.F. Fegen
- LÉ Connacht (S1)
- LÉ Munster (S2)
- LÉ Ulster (S3)
- LÉ Leinster (S4)
Second Division - Cheannasaí E. David Campbell
- LÉ Contae Dhún na nGall (S5) (County Donegal)
- LÉ Contae Laoise (S6) (County Laois)
- LÉ Contae Loch Garman (S7) (County Wexford)
- LÉ Contae an Chabháin (S8) (County Cavan)

The Sloop Squadron - based in Haulbowline, Munster
- LÉ Airmed (F5) - Static training ship, Galway
- LÉ Morrigan (F6) - Assigned to Lough Swilly Submarine School/Antisubmarine School
- LÉ Danu (F7)
- LÉ Shannon (F9)

The Submarine Flotilla - based in Castletownbere/Berehaven, Munster - Cheannasaí Michael Muldoon
- LÉ Selkie (FO-3) - Built 1918, acquired 1937
- LÉ Sheevra (FO-4) - Built 1918, acquired 1937
- LÉ Cat Sith (FO-5) - Built 1918, acquired 1937

The Minesweeper Squadron - based in Galway, Connacht
First Minesweeper Division - Leifteanant-Cheannasaí Jack Byrne
- LÉ Aisling (SF-1)
- LÉ Emer (SF-2)
- LÉ Fola (SF-3)
- LÉ Banba (SF-4)
Second Minesweeper Division - Leifteanant-Cheannasaí Joseph MacNamara
- LÉ Maeve (SF-5)
- LÉ Cliona (SF-6)
- LÉ Fand (SF-7)
- LÉ Ness (SF-8)

1st Subchaser Squadron - based in Haulbowline, Munster
First Subchaser Division - Leifteanant-Cheannasaí Brian McKeown
- LÉ Orla (LF-1)
- LÉ Etain (LF-2)
- LÉ Macha (LF-3)
- LÉ Achall (LF-4)
Second Subchaser Division - Leifteanant-Cheannasaí Patrick Ryan
- LÉ Roisin (LF-5)
- LÉ Scathach (LF-6)
- LÉ Uathach (LF-7)
- LÉ Ciara (LF-8)

1st Torpedo Boat Squadron - based in Dun Laoghaire, Leinster - Leifteanant Gilroy Cunningham
- LÉ M1 (MTB-1)
- LÉ M2 (MTB-2)
- LÉ M3 (MTB-3)
- LÉ M4 (MTB-4)
- LÉ M5 (MTB-5)
- LÉ M6 (MTB-6)
- LÉ M7 (MTB-7)
- LÉ M8 (MTB-8)

2nd Torpedo Boat Squadron - based in Cobh, Munster- Leifteanant Sean O'Byrne
- LÉ M9 (MTB-9)
- LÉ M10 (MTB-10)
- LÉ M11 (MTB-11)
- LÉ M12 (MTB-12)
- LÉ M13 (MTB-13)
- LÉ M14 (MTB-14)
- LÉ M15 (MTB-15)
- LÉ M16 (MTB-16)

3rd Torpedo Boat Squadron - based in Haulbowline, Munster- Leifteanant Michael Allingham
- LÉ BGM1
- LÉ BGM2
- LÉ BGM3

The Training Squadron - based in Haulbowline, Munster
- LÉ Muirchu (BGM-1)

The Support Squadron - based in Haulbowline, Munster - Leifteanant-Cheannasaí Timothy Finnegan
- LÉ Bres (YTB-1) (out of Haulbowline)
- LÉ Nuada (YTB-2) (out of Galway)
- LÉ Meath (F1) (out of Haulbowline)
- LÉ Carrauntoohil (BDV-1) (out of Dun Laoghaire)

The Patrol Squadron - based in Galway, Connacht (operated under Department of Fisheries control with INS crews) - Cheannasaí Hugh Kennedy
- LÉ Deirdre (F1)
- LÉ Eithne (F2)
- LÉ Aoife (F3)
- LÉ Niamh (F4)

Quoted

The Atlantic Squadron - based in Haulbowline, Munster - Captaen (acting Commodore) Edward S.F. Fegen
- LÉ Granuaile (CU-1) flagship
- LÉ Meath (F1) (support ship)

First Destroyer Squadron - Captaen Edward S.F. Fegen
- LÉ Connacht (S1)
- LÉ Munster (S2)
- LÉ Ulster (S3)
- LÉ Leinster (S4)
- LÉ Contae Mhuineacháin / County Monaghan (S9)

Quoted

The Escort Squadron - based in Haulbowline, Munster
First Frigate Squadron - Cheannasaí Jack Byrne
- LÉ Airmed (F5)
- LÉ Morrigan (F6) - Assigned to Lough Swilly Submarine School/Antisubmarine School
- LÉ Danu (F7)
- LÉ Shannon (F9)

First Subchaser Division - Leifteanant-Cheannasaí Brian McKeown
- LÉ Orla (LF-1)
- LÉ Etain (LF-2)
- LÉ Macha (LF-3)
- LÉ Achall (LF-4)

Second Subchaser Division - Leifteanant-Cheannasaí Patrick Ryan
- LÉ Roisin (LF-5)
- LÉ Scathach (LF-6)
- LÉ Uathach (LF-7)
- LÉ Ciara (LF-8)

Quoted

Submarine Command - based in Castletownbere/Berehaven, Munster - Cheannasaí Michael Muldoon
Training Division
- LÉ Bradán Feasa (FO-6)
- LÉ Leanashe (FO-7)

First Submarine Squadron
- LÉ Pooka (FO-8)
- LÉ Selkie (FO-9)
- LÉ Sheevra (FO-10) (working up)
- LÉ Oilliphéist (FO-11) (working up)
- LÉ Cat Sith (FO-12) (under construction)
- LÉ Tuatha Dé Danann (FO-13) (under construction)
- LÉ Aos Sí (FO-14) (under construction)
- LÉ Murúch (FO-15) (under construction)

Quoted

Coastal Forces Command - based in Haulbowline, Munster
1st Torpedo Boat Squadron - based in Dun Laoghaire, Leinster
M-1, M-2, M-3, M-4, M-5, M-6, M-7, M-8

2nd Torpedo Boat Squadron - based in Cobh, Munster
M-9, M-10, M-11, M-12, M-13, M-14, M-15, M-16

3rd Torpedo Boat Squadron - based in Haulbowline, Munster
BGM-1, BGM-2, BGM-3, BGM-4, BGM-5, BGM-6, BGM-7, BGM-8, BGM-9, BGM-10, BGM-11, BGM-12

Quoted

The Support Squadron - based in Haulbowline, Munster - Cheannasaí Timothy Finnegan
- LÉ Bres (YTB-1) (out of Haulbowline)
- LÉ Nuada (YTB-2) (out of Galway)
- LÉ Carrauntoohil (BDV-1) (out of Dun Laoghaire)

The Training Squadron - based in Haulbowline, Munster
- LÉ Muirchu (BGM-1) - static training ship

Quoted

Department of Fisheries - based in Galway, Connacht - Cheannasaí Hugh Kennedy
- LÉ Aoife (F3)
- LÉ Niamh (F4)

Quoted

In Ordinary
Second Destroyer Division
- LÉ Contae Dhún na nGall (S5) (County Donegal)
- LÉ Contae Laoise (S6) (County Laois)
- LÉ Contae Loch Garman (S7) (County Wexford)
- LÉ Contae an Chabháin (S8) (County Cavan)