| School | Address | City | Province | Postal Code |
| Lakefield College School | Lakefield | ON | K0L 2H0 | |
| Lambrick Park Secondary | 4139 Torquay Drive | Victoria | BC | V8N 3LI |
| Langley Fine Arts School | 9096 Trattle Street | Fort Langley | BC | V1M 2S6 |
| Langley Secondary School | 21405 - 56th Avenue | Langley | BC | V2Y 2N1 |
| Langstaff Secondary School | 106 Garden Avenue | Richmond Hill | ON | L4C 6M1 |
| Lashburn High School | Box 430 | Lashburn | SK | S0M 1H0 |
| Lawrence Park Collegiate Institute | 125 Chatsworth Drive | Toronto | ON | M4R 1S1 |
| Leaside High School | 200 Hanna Road | Toronto | ON | M4G 3N8 |
| Leduc Composite High School | 4308 50th Street | Leduc | AB | T9E 6K8 |
| Lester Pearson Collegiate Institute | 150 Tapscott Road | Toronto | ON | M1B 2L2 |
| Lethbridge Collegiate Institute | 57th Ave and 17th St. S. | Lethbridge | AB | T1K 3B6 |
| Lindsay Collegiate & Vocational Institute | 260 Kent St. West | Lindsay | ON | K9V 2Z5 |
| Lisgar Collegiate Institute | 29 Lisgar Street | Ottawa | ON | K2P 0B9 |
| Little Flower Academy | 4195 Alexandra Street | Vancouver | BC | V6J 4C6 |
| Lively District Secondary School | 265 5th Avenue | Lively | ON | P3Y 1M4 |
| Lloydminster Comprehensive High School | 5615 - 42nd Street | Lloydminster | SK | T9V 0A2 |
| Lo-Ellen Park Secondary School | 275 Loach's Road | Sudbury | ON | P3E 2P8 |
| London Central Secondary School | 509 Waterloo Street | London | ON | N6B 2P8 |
| London South Collegiate Institute | 371 Tecumseh Avenue | London | ON | N6C 1T4 |
| Lord Beaverbrook Sr. High School | 9019 Fairmount Drive S. E. | Calgary | AB | T2H 0Z4 |
| Lord Byng Secondary School | 3939 West 16th Avenue | Vancouver | BC | V6R 3C9 |
| Lord Dorchester Secondary School | 61 Queen Street | Dorchester | ON | N0L 1G2 |
| Lord Selkirk School | 221 Mercy Street | Selkirk | MB | R1A 2C8 |
| Lord Tweedsmuir Senior Secondary | 6151 180th Street | Surrey | BC | V3S 4L5 |
| Loretto Abbey Catholic High School | 101 Mason Boulevard | Toronto | ON | M5M 3E2 |
| Lower Canada College | 4090 Royal Avenue | Montreal | QC | H4A 2M5 |
| Loyalist Collegiate & Vocational Institute | 153 Van Order Drive | Kingston | ON | K7M 1B9 |
| Lumsden High School | Box 449 | Lumsden | SK | S0G 3C0 |
| Lycée Claudel | 1635 Promenade Riverside | Ottawa | ON | K1G 0E5 |
| Lycée français de Toronto | 2327 Dufferin Street | Toronto | ON | M6E 3S5 |