| Mary | Genetic Designer | | 70/30 | View variety |
| Mary’s Gift | Sunny Valley Seed Co | | 70/30 | View variety |
| MARZ | Envy Genetics | | 70/30 | View variety |
| Masala OG | Lady Sativa Genetics | KnightsBridge OG · Knightsbridge OG × Chem 91 · F2 by Elite Genetics · (91 Skunk VA) | 60/40 | View variety |
| Mashed Manzana | Mephisto Genetics | | 60/40 | View variety |
| Mass Chem | MassMedicalStrains | | 50/50 | View variety |
| Mass Effect | Canadian Cannabis Genetics | | 60/40 | View variety |
| Mass Shooter Auto | Garden of Green | | 50/50 | View variety |
| Mass Super Skunk BX | Top Dawg Seeds | | 60/40 | View variety |
| Massive GMO Punch | Massive Seeds | | 50/50 | View variety |
| Massive Midget | Heavyweight Seeds | | 40/60 | View variety |
| Massive Punch | Massive Seeds | | 80/20 | View variety |
| MassSuperSkunk | Unknown | | 60/40 | View variety |
| Master Bruce | Night Owl Seeds | | 60/40 | View variety |
| Master Chronic | DutchBreed | | 50/50 | View variety |
| Master Cookies | Mamiko Seeds | | 70/30 | View variety |
| Master Duck | H.B.K. Genetics | | 60/40 | View variety |
| Master Haze | De Sjamaan | | 50/50 | View variety |
| Master Haze | The Global Seedbank | | 20/80 | View variety |
| Master Ice | No Mercy Supply | | 60/40 | View variety |