| Harbour Authority of Jackson's Cove | 3610934 | Jackson's Cove, NL | Active |
| HARBOUR AUTHORITY OF JONES HARBOUR | 3307778 | East Sable River, NS | Active |
| HARBOUR AUTHORITY OF JOUSSARD INC. | 3359891 | Joussard, AB | Active |
| Harbour Authority of Jude's Point/Tignish | 3257631 | Tignish, PE | Active |
| HARBOUR AUTHORITY OF JUDIQUE BAXTER'S | 3010210 | Judique, NS | Active |
| Harbour Authority of KEGASKA AND WOLFBAY | 2717115 | Kegaska, QC | Active |
| Harbour Authority of L'Anse au Clair | 3484394 | L'Anse au Clair, NL | DissolvedFor missed filings |
| HARBOUR AUTHORITY OF L'ANSE AU LOUP | 2636514 | L'Anse au Loup, NL | Active |
| HARBOUR AUTHORITY OF L'ARCHEVEQUE | 3314405 | Grand River, Richmond Co, NS | DissolvedFor missed filings |
| HARBOUR AUTHORITY OF LA SCIE | 2585448 | La Scie, NL | Active |
| Harbour Authority of La Tabatiere and Mutton Bay | 2719762 | La Tabatiere, QC | Active |
| Harbour Authority of Ladle Cove - Aspen Cove | 3843483 | Ladle Cove, NL | Active |
| HARBOUR AUTHORITY OF LAMALINE | 3456285 | Lamaline, NL | Active |
| Harbour Authority of Lark Harbour - York Harbour - Little Port | 3352269 | Lark Harbour, NL | Active |
| HARBOUR AUTHORITY OF LARRY'S RIVER | 3235351 | Larry's River, NS | Active |
| HARBOUR AUTHORITY OF LAUNCHING POND | 3230392 | Cardigan, PE | Active |
| HARBOUR AUTHORITY OF LAWN | 3456277 | Lawn, NL | Active |
| Harbour Authority of Leading Tickles | 2743914 | Leading Tickles, NL | Active |
| HARBOUR AUTHORITY OF LEDGE HARBOUR | 3181600 | Yarmouth County, NS | Active |
| HARBOUR AUTHORITY OF LISCOMB/LITTLE LISCOMB | 3459527 | Liscomb, NS | Active |
| Harbour Authority of Little Bay | 9526765 | Little Bay Pb, NL | Active |
| Harbour Authority of Little Burnt Bay | 3454592 | Little Burnt Bay, NL | Active |
| HARBOUR AUTHORITY OF LITTLE DOVER | 3256472 | Little Dover, NS | Active |
| HARBOUR AUTHORITY OF LITTLE HARBOUR EAST | 3738388 | Little Harbour East, NL | Active |
| HARBOUR AUTHORITY OF LITTLE HARBOUR (HALIFAX COUNTY) | 3895343 | Sheet Harbour, NS | Active |
| HARBOUR AUTHORITY OF LITTLE HARBOUR, RICHMOND COUNTY | 3314049 | Lower L'Ardoise, NS | Active |
| HARBOUR AUTHORITY OF LITTLE HARBOUR (SHELBURNE CO.) | 2664518 | Shelburne, NS | Active |
| HARBOUR AUTHORITY OF Little Heart's Ease | 7796617 | Little Hearts Ease, NL | Active |
| HARBOUR AUTHORITY OF LITTLE JUDIQUE HARBOUR | 3243206 | Little Judique Harbour, NS | DissolvedEnded under the old Canada Corporations Act |
| Harbour Authority of Little Port Harmon | 3881148 | Stephenville, NL | Active |
| Harbour Authority of Little River (Digby County) | 3688178 | Little River Digby, NS | AmalgamatedNow part of another corporation |
| HARBOUR AUTHORITY OF LITTLE RIVER HARBOUR | 2478536 | Arcadia, NS | Active |
| HARBOUR AUTHORITY OF LITTLE RIVER-VICTORIA CO. | 3147665 | Baddeck, NS | Active |
| HARBOUR AUTHORITY OF LIVINGSTONES COVE | 3481549 | Livingstones Cove, NS | Active |
| HARBOUR AUTHORITY OF LOCKEPORT | 3312143 | Lockeport, NS | Active |
| Harbour Authority of Loggiecroft | 3258505 | Kouchibouguac, NB | Active |
| HARBOUR AUTHORITY OF LOGGIEVILLE | 3761932 | Miramichi, NB | Active |
| HARBOUR AUTHORITY OF LONG COVE | 3250067 | Long Cove, NL | Active |
| Harbour Authority of Long Island | 2653443 | Beaumont, NL | Active |
| HARBOUR AUTHORITY OF LORD'S COVE | 2653451 | Lord's Cove, NL | DissolvedFor missed filings |
| Harbour Authority of Lorneville and Five Fathom Hole | 3418936 | Saint John, NB | Active |
| Harbour Authority of Louisbourg | 3775402 | Louisbourg, NS | Active |
| Harbour Authority of Lourdes | 4059735 | Lourdes, NL | Active |
| Harbour Authority of Lower East Pubnico | 2446588 | Lower East Pubnico, NS | Active |
| HARBOUR AUTHORITY OF LOWER ISLAND COVE | 3262448 | Lower Island Cove, NL | DissolvedFor missed filings |
| HARBOUR AUTHORITY OF LOWER JORDAN BAY | 2805685 | Jordan Bay, NS | Active |
| Harbour Authority of Lower Montague | 3595536 | Montague, PE | Active |
| HARBOUR AUTHORITY OF LOWER SANDY POINT | 3193187 | Shelburne, NS | Active |
| Harbour Authority of Lumsden | 2575850 | Lumsden, NL | Active |
| HARBOUR AUTHORITY OF LUNENBURG | 2427524 | Lunenburg, NS | Active |