| HARBOUR AUTHORITY OF LUNENBURG | 2427524 | Lunenburg, NS | Active |
| HARBOUR AUTHORITY OF MABOU HARBOUR | 3220371 | Mabou, NS | Active |
| HARBOUR AUTHORITY OF MACEACHERN'S POINT | 2752964 | Tabusintac, NB | Active |
| Harbour Authority of Machons Point | 3365689 | Murray Harbour, PE | Active |
| HARBOUR AUTHORITY OF MAIN-A-DIEU | 3621154 | Main-A-Dieu, NS | Active |
| Harbour Authority of Mainland - Three Rock Cove | 4026420 | Mainland, NL | DissolvedFor missed filings |
| Harbour Authority of Makkovik | 3987248 | Makkovik, NL | Active |
| HARBOUR AUTHORITY OF MALAGASH | 3149757 | Malagash Centre, NS | Active |
| HARBOUR AUTHORITY OF MALPEQUE | 3396690 | Malpeque, PE | Active |
| Harbour Authority of Margaree - Fox Roost | 3693554 | Channel-Port-Aux-Basques, NL | Active |
| Harbour Authority of Margaree Harbour | 2588188 | Belle Cote, NS | Active |
| HARBOUR AUTHORITY OF MARIE JOSEPH | 3307441 | Marie Joseph, NS | Active |
| Harbour Authority of Mary's Harbour | 8914591 | Mary's Harbour, NL | Active |
| HARBOUR AUTHORITY OF MARYVILLE | 3357287 | Judique, Inverness Co, NS | Active |
| Harbour Authority of McAuley's Shore | 2461773 | Belfast, PE | Active |
| Harbour Authority of McCallum | 3833411 | McCallum, NL | Active |
| Harbour Authority of Meteghan | 3179061 | Meteghan, NS | Active |
| Harbour Authority of Miawpukek | 4500482 | Conne River, NL | Active |
| HARBOUR AUTHORITY OF MIDDLE BAY | 2737841 | Blanc Sablow, QC | DissolvedFor missed filings |
| Harbour Authority of Miles Cove | 3919137 | Miles Cove, NL | Active |
| HARBOUR AUTHORITY OF MILL COVE | 3989445 | Mill Cove, NS | Active |
| Harbour Authority of Milligan's Shore | 3375480 | Ellerslie, PE | Active |
| Harbour Authority of Miminegash | 3246841 | Saint Louis, PE | Active |
| Harbour Authority of Ming's Bight | 3335666 | Ming's Bight, NL | Active |
| Harbour Authority of Mink River | 3225925 | Montague, PE | Active |
| Harbour Authority of Montague | 4193202 | Montague, PE | Active |
| HARBOUR AUTHORITY OF MOOSE HARBOUR | 3321428 | Liverpool, NS | Active |
| Harbour Authority of Mount Arlington Heights | 3576922 | Long Harbour, NL | Active |
| Harbour Authority of Murray Harbour, P.E.I. | 3471977 | Murray Harbour, PE | Active |
| Harbour Authority of Murray River | 3511561 | Murray River, PE | Active |
| Harbour Authority of Musgrave Harbour | 2575868 | Musgrave Harbour, NL | Dissolution pendingAnnual filings overdue |
| Harbour Authority of Nain, Labrador | 3719804 | Nain, NL | DissolvedFor missed filings |
| Harbour Authority of Naufrage | 3471993 | Sour, PE | Active |
| HARBOUR AUTHORITY OF NEIL'S HARBOUR/NEW HAVEN | 3262901 | Neils Harbour, NS | DissolvedFor missed filings |
| HARBOUR AUTHORITY OF NEW HARBOUR | 3301087 | Larry's River, NS | Active |
| HARBOUR AUTHORITY OF NEW HARBOUR, T.B. | 3352315 | New Harbour, NL | Active |
| HARBOUR AUTHORITY OF NEW LONDON | 3758494 | Summerside, PE | Active |
| HARBOUR AUTHORITY OF NEW MILLS | 3259994 | New Mills, NB | Active |
| HARBOUR AUTHORITY OF NEW WATERFORD | 3465705 | New Waterford, NS | Active |
| HARBOUR AUTHORITY OF NEWELLTON | 2664526 | Clark's Harbour, NS | DissolvedFor missed filings |
| HARBOUR AUTHORITY OF NEWMANS COVE | 4148550 | Newmans Cove, NL | Active |
| HARBOUR AUTHORITY OF NEWTOWN | 2704480 | Newtown, NL | Active |
| Harbour Authority of Nine Mile Creek | 3246868 | Rice Point, PE | Active |
| Harbour Authority of Nipper's Harbour | 2718171 | Nipper's Harbour, NL | Active |
| Harbour Authority of Norris Point | 3960846 | Norris Point, NL | Active |
| Harbour Authority of North Lake | 3464407 | North Lake, PE | Active |
| Harbour Authority of North Rustico | 3167003 | North Rustico, PE | Active |
| HARBOUR AUTHORITY OF NORTH SYDNEY BALLAST GROUNDS | 3368807 | Sydney Mines, NS | Active |
| HARBOUR AUTHORITY OF NORTH WEST COVE | 3196135 | Hubbards, NS | Active |
| HARBOUR AUTHORITY OF NORTHPORT | 3354687 | Northport, NS | Active |