You can watch “The Boys” online primarily on Amazon Prime Video. This includes all current seasons, including the recently released Season 4. If you have an Amazon Prime subscription, you can stream the series without additional cost. Alternatively, you can watch it with ads on Freevee, which is also available through Amazon Prime Video​ (JustWatch)​​ (JustWatch)​.

If you prefer to own the episodes, you can purchase them as downloads on platforms like Apple TV, Vudu, Microsoft Store, and Google Play Movies​ (JustWatch)​.