| Name | Flag | Type | Location | Fate |
|---|
| HMCS Acadia | Canada | Auxiliary Patrol Ship acting as Bedford Basin Guard ship | East side, Bedford Basin entrance | Minor damage. (Now part of the Maritime Museum of the Atlantic & the last surviving vessel from the explosion). |
| Acadian | Canada | General Cargo | Inbound, 15 miles from Halifax | Undamaged,felt concussion, saw blast cloud |
| Baleine (RCN) | Canada | Minesweeping trawler | Sweeping Harbour approaches for mines | Felt explosion, undamaged, continued sweeps |
| Booton | Canada | Tug | | Towed Old Colony to No. 4 Dockyard Pier for emergency hospital duty |
| CC 1 & CC 2 | Canada | Submarines | At Dockyard Pier 1 under refit | Broke moorings, minor injuries |
| CD-73 | Canada | Coastal Drifter acting as Duty Boat | To Niobe for Supplies | Badly damaged, crew injured |
| Calonne | Britain | General Cargo | Loading horses at Pier 9 | Severely damaged, hove over, 36 crew killed |
| HMCS Canada | Canada | Auxiliary Patrol Ship | Dockyard Anchorage by Jetty 2 | Minor damage, 1 serious injury, crew sent ashore to assist |
| HMCS Cartier | Canada | Auxiliary Patrol Ship | At Dockyard Jetty 3 following coaling | Minor damage |
| HMS Changuinola | Britain | Armed Merchant Cruiser (Escort Ship) | At Dockyard anchorage | Minor Damage. Crew assists in rescue |
| Clara | United States | General Cargo "Tramp Steamer" | Arriving Bedford Basin from Narrows | Proceeded Mont Blanc through Narrows, complicating Imo and Mont Blanc manoeuvres. |
| Curaca | Britain | General Cargo | Loading horses at Pier 8 | Blown across harbour, sank at Tufts Cove, 45 crew killed, refloated in 1918 |
| Dartmouth | Canada | Harbour Ferry | | Damaged but continued running |
| Douglas H. Thomas | Canada | Tug | At Dry Dock wharf | Severe damage, 3 deaths, towed to safety in Dartmouth |
| F.W. Roebling | Canada | Schooner | | Severe damage, 1 death |
| HMCS Grilse | Canada | Torpedo Boat Destroyer (Armed Yacht) | Dockyard Jetty 2 on stand by for Harbour Defence | Minor damage & injuries |
| CGS Gulnare | Canada | Bedford Basin Guard Vessel, anchored off Africville | West Side Bedford Basin entrance | Minimal damage |
| Halifax (II) | Canada | Harbour Ferry | Mid Harbour approaching Halifax | Serious damage but continued running. Many minor glass injuries |
| HMS Highflyer | Britain | Light Cruiser | At Dockyard Anchorage | Damaged, 3 killed 50 injuries, crew assists with rescue |
| Hilford | Canada | Tug, RN Charter, Port Convoy Office | Returning from basin convoy liason, at Pier 9 to raise alarm | Severe damage, blown out of water onto Pier 9. Only 2 survived. |
| HMCS Hochelaga | Canada | Auxiliary Patrol Ship | At anchor in harbour awaiting Pier 4 berth | Minor damage & injuries |
| Hovland | Norway | General Cargo | In Dry Dock for repairs | Upper works seriously damaged, Five crew members killed |
| J.A. McKee | Canada | Coal Carrier | At Dry Dock Wharf for repairs | Heavily damaged, no deaths |
| HMS Knight Templar | Britain | Commissioned Escort Ship | At Dockyard Anchorage | |
| HMCS Lady Evelyn | Canada | Auxiliary Patrol Ship | On patrol Harbour Approaches | Felt explosion, undamaged, went to action stations to face possible attack |
| Lola R. | Canada | Schooner | From Herring Cove to inner harbour | "Blown to pieces" |
| Maggie | Canada | Tug, RN Charter, Port Convoy Office | Downtown Halifax piers | Carried relief parties & surgeons ashore from RN ships |
| HMCS Margaret | Canada | Auxiliary Patrol Ship | At Dockyard Jetty 2 | Broke moorings, minor damage, two crew members killed ashore |
| Middleham Castle | Britain | General Cargo | Preparing to leave Dry Dock wharf for sea | Heavily damaged, lost funnel |
| USS Morrill | USA | US Coast Guard patrol vessel | At anchor, Dartmouth Cove awaiting supplies | Damaged |
| Musquash | Canada | RCN Minesweeping Trawler | At Dry Dock Wharf | Set afire and adrift |
| Nereid | Canada | RCN Armed Tug (Examination Service) | At anchor off Dockyard Pier 4, near Niobe | Moderate damage |
| HMCS Niobe | Canada | Cruiser, Depot Ship | Hospital Wharf, north end of Dockyard | Serious Damage. Several crew, including entire pinnace crew, killed. Surviving crew assisted ashore. |
| USS Old Colony | USA | Ex passenger ship bound for Britain for naval conversion | At dry dock wharf awaiting boiler repair | Manned as temporary hospital by naval surgeons |
| PV-V (RCN) | Canada | Minesweeping trawler | Dockyard Jetty 3 for refit | Moderate damage |
| PV-VII (RCN) | Canada | Minesweeping trawler | Sweeping Harbour approaches for mines | Felt explosion, undamaged, continued sweeps |
| Picton | Britain | General Cargo, including munitions | At Sugar Refinery Wharf | Badly damaged & set ablaze by explosion |
| Ragus | Canada | Sugar Refinery Tug | At sugar refinery wharf | Heavily damaged, most crew killed |
| Sambro | Canada | Shipyard Tug | Graving Dock Wharf | Sunk. Raised in 1920s & renamed Erg |
| t. Bernar | Demerara, British Guiana | Schooner | Unloading Lumber, Pier 6 | Completely destroyed. Crew of 3 killed |
| Stella Maris | Canada | Tug under RCN charter, ex RN gunboat | At Pier 6 attempting to tow Mont Blanc | Severely damaged, 19 crew killed, 5 survive |
| USS Tacoma | USA | Third Class Cruiser | 50 miles at sea off Halifax | Felt blast, came into port to assist with rescue |
| Togo | Canada | Tug | Naval Dockyard | Took wounded from rescue parties to USS Old Colony |
| USS Von Steuben | USA | Armed Troop Transport | At sea off Halifax | Felt blast, came into port to assist with rescue |
| W.H. Lee | Canada | Naval Motor Boat | At Dockyard Coaling Wharf | Fought fires on damaged vessels |