The Royal Navy Order of Battle - This list shows the order of battle for naval operations between February 19th to April 25th, 1915. 

The Royal Navy at The Dardanelles

 from Naval Operations, Vol. II, chapter IX, page 144

(February 19th, 1915 - the bombardment of the entrance forts)

 FIRST DIVISION

Inflexible

Agamemnon

Queen Elizabeth

SECOND DIVISION

Vengeance

Albion

Cornwallis

Irresistible

Triumph

THIRD DIVISION

Suffren

Bouvet

Charlemagne

Gaulois

from Naval Operations, Vol. II, chapter X, page 170

(March 2nd, 1915 – the attack on Fort Dardanos and in the Gulf of Xeros)

DIVISION I

1st Sub-Division

Queen Elizabeth – Captain G. P. W. Hope

Inflexible (flag) – Captain R. F. Phillimore

2nd Sub-Division

Agamemnon – Captain H. A. S. Fyler

Lord Nelson – Captain J. W. L. McClintock

DIVISION II

Vengeance, Div. Flagship – Captain Bertram H. Smith

3rd Sub-Division

Ocean – Captain A. Hayes-Sadler

Irresistible – Captain D. L. Dent

Majestic – Captain H. F. G. Talbot

4th Sub-Division

Canopus – Captain Heathcoat S. Grant

Cornwallis – Captain A. P. Davidson

Swiftsure – Captain C. Maxwell-Lefroy

5th Sub-Division

Albion – Captain A. W. Heneage

Triumph – Captain M. S. FitzMaurice

Prince George – Captain A.V. Campbell

DIVISION III

Suffren (flag) - Admiral Guépratte

Bouvet – Captain Rageot de la Touche

Gaulois – Captain Biard

Charlemagne – Captain Lagrésille

There were also four light cruisers:-

Dublin – Captain John D. Kelly

Sapphire – Captain P. W. E. Hill

Minerva – Captain P. H. Warleigh

Amethyst – Commander G. J. Todd

from Naval Operations, Vol. II, chapter XIII, page 213,

(March 18-24, 1915 – the attack on The Narrows)

FIRST DIVISION

1st Sub-Division

Queen Elizabeth (Admiral de Robeck)

Inflexible

2nd Sub-Division

Agamemnon

Lord Nelson

SECOND DIVISION

3rd Sub-Division

Ocean (Captain Hayes-Sadler)

Irresistible

Albion

Vengeance

4th Sub-Division

Swiftsure

Majestic

5th Sub-Division

Canopus

Cornwallis

THIRD DIVISION (Admiral Guépratte)

6th Sub-Division

Sufren

Bouvet

Gaulois

Charlemagne

7th Sub-Division

Triumph

Prince George 

from Naval Operations, Vol. II, chapter XVI, page310,

(April 19, 1915 – in preparation for the landings)

Fleet Flagship: Queen Elizabeth

Commanding: Vice-Admiral (Act.) John M. de Robeck

Chief of Staff: Commodore Roger J. B. Keyes

Captain G. P. W. Hope

FIRST SQUADRON

Rear-Admiral Rosslyn E. Wemyss

2nd in command: Rear-Admiral Stuart Nicholson

Battleships:

Swiftsure (2nd flag) – Captain C. Maxwell-Lefroy

Albion – A. W. Heneage (Captain 'S'), Acting Captain, Commander H. L. Watts-Jones

Lord Nelson – Captain J. W. L. McClintock

Implacable – Captain H. C. Lockyer

Vengeance – Captain B. H. Smith

Prince George – Captain A. V. Campbell (attached to Rear-Admiral Guépratte's squadron

for the landing operations of April 25th)

Goliath – Captain T. L. Shelford

Cornwallis – Captain A. P. Davidson

Cruisers:

Minerva – Captain P. H. Warleigh

Euryalus (flag) – Captain R. M. Burmester

Talbot – Captain Fawcet Wray

Dublin – Captain J. D. Kelly

Six fleet-sweepers 

SECOND SQUADRON

Rear-Admiral Cecil F. Thursby

Battleships:

Queen (flag) – Captain H. A. Adam

London – Captain J. G. Armstrong

Prince of Wales – Captain R. N. Bax

Triumph – Captain M. S. FitzMaurice

Majestic – Captain H. F. G. Talbot

Cruiser:

Bacchante – Captain The Hon. A. D. E. H. Boyle

Adamant, submarine depot ship – Commander F. A. Somerville

Ark Royal, seaplane carrier – Commander R. H. Clark-Hall

Manica, balloon ship – Lieutenant D. H. Metcalfe

Eight destroyers – Captain C. P. R. Coode (Captain 'D')

Four trawlers

THIRD SQUADRON

Captain Heathcoat S. Grant

Battleship:

Canopus – Captain Heathcoat S. Grant

Cruisers:

Dartmouth – Captain Judge d'Arcy

Doris – Captain F. Larken

Two destroyers

Two trawlers

FOURTH SQUADRON

(Attached to First Squadron)

Cruisers:

Sapphire – Commander P. W. E. Hill

Amethyst – Commander G. J. Todd

Twelve trawlers

FIFTH SQUADRON

Captains H. A. S. Fyler and A. W. Heneage (Captain 'S')

Battleship:

Agamemnon – Captain H. A. S. Fyler

Ten destroyers

Three French minesweepers

Two trawlers for net-laying

SIXTH SQUADRON

Rear-Admiral P. F. A. H. Guépratte

Battleships:

Jauréguiberry (flag) – Captain A. R. Beaussant

Henri IV – Captain G. F. C. Varney

Charlemagne - Captain J. A. E. Salaun (did not take part in operations of April 25th)

Cruisers:

Latouche-Tréville – Captain C. H. Dumesnil (did not take part in operations of April 25th)

Jean D'Arc – Captain M. F. A. Grasset

Askold – Captain S. Ivanov

Savoie – Captain Tourrette

Seven destroyers

Five torpedo boats

SEVENTH SQUADRON (Smyrna blockade)

Captain C. P. Metcalf

Four destroyers

Triad, armed yacht – Commander A. L. Ashby 

The Royal Navy at the Dardanelles

This list is taken from the Helles Memorial where the names of the ships can be seen on one side of the obelisk and on panels 216, 217, 333, 334 & 335 around the memorial wall.

[obelisk panel]

Battleships: Agamemnon, Albion, Conopus, Cornwallis, Exmouth, Glory, Goliath, Hibernia. Implacable, Irresistible, London, Lord Nelson, Majestic, Mars, Ocean, Prince George, Prince of Wales, Queen, Queen Elizabeth, Russell, Swiftsure, Triumph, Venerable, Vengeance, Zealandia

Battle Cruiser: Inflexible

Cruisers: Bacchante, Blenheim, Cornwall, Edgar, Endymion, Euryalus, Grafton, Theseus

[tablets 216, 217]

Light Cruisers: Amethyst, Chatham, Dartmouth, Doris, Dublin, Foresight, Forward, Latona, Minerva, Sapphire, Sentinel, Skirmisher, Talbot.

Torpedo Boat Destroyers: Arno, Basilisk, Beagle, Bulldog, Chelmer, Colne, Comet, Foxhound, Fury, Grampus, Grasshopper, Harpy, Jed, Kennet, Laporey, Lawford, Louis, Lydiard, Mosquito, Pincher, Racoon, Rattlesnake, Renard, Ribble, Savage, Scorpion, Scourge, Staunch, Usk, Wear, Welland, Wolverine

Torpedo Boats: 043, 044, 046, 063, 064, 070

Monitors: Abercrombie, Earl of Peterborough, Havelock, Humber, Raglan, Roberts, Sir Thomas Picton, M15, M16, M17, M18, M19, M20, M21, M22, M28, M29, M30, M31, M32, M33

Sloops: Anemone, Aster, Azalea, Heliotrope, Honeysuckle, Jonquil, Peony

[tablets 333, 334 & ,335]

Kite Balloon Ships: Canning, Hector, Manica

Seaplane Carriers: Ark Royal, Ben-My-Cree

Armed Boarding Steamers: Carron, Fauvette, Hazel, Heroic, Hythe, Rowan, Sarnia, Snaefell

Gun-Boats: Anzac, Hussar, Marie Rose, Penelope

Net Laying Vessels: Prince Edward, Queen Victoria

Submarines: E2, E7, E11, E12, E14, E15, E20, B6, B7, B8, B9, B10, B11, AE2, H1, H2, H4

Minesweepers: 293 Achilles, Andros (tug), 705 Avon, 362 Beatrice II, Coronatia, 706 Elk,

43 Escallonia, 448 Fentonian, 49 Frascati, 308 G.M., 354 Gwenllian, 324 Koorah, 340 Lock Esk, Manx Hero, Okino, 341 Prince Palatine, 1043 Renarro, 48 Restrivo, 258 Richmond Castle, 284 Soldier Prince, 318 Star of the Empire, 92 Strathlossie, 102 Strathord, 209 (?)  Syringa, 10 Vidonia, 719 William Allan

Auxiliary Sweepers: Clackton, Folkestone, Gazelle, Lynn, Newmarket, Reindeer, Whitby Abbey

Minelayer: Angora

Collier: River Clyde