A Practice Note providing an overview of US patent law in the growing legal cannabis industry. This Note discusses issues facing patent counsel navigating the legality and patentability of cannabis inventions, including those involving marijuana, hemp, delta-9-tetrahydrocannabinol (THC), and cannabidiol (CBD), and considerations and strategies for obtaining, enforcing, and licensing patents in this unsettled legal environment. It provides information on how to patent different types of cannabis-related inventions, including through utility patents, plant patents, and plant variety protection.