Forza Horizon 3 offers robust online multiplayer options, allowing you to race and explore with friends or other players. The main online modes are:

- Online Adventure: Compete in a series of races and games against other players. These adventures are structured championships that combine various event types.
- Online Freeroam: Join a session with up to 11 other players and explore the open world together. You can challenge each other to races, cruise around, or simply enjoy the scenery.
- Co-op Campaign: Play through the entire main campaign with up to three friends. All progress, including fans and festival upgrades, is shared among the group, making it a fantastic way to experience the game together.
Engaging in online activities is a great way to test your skills against human opponents and earn additional rewards. The Co-op Campaign is particularly rewarding, as it allows you to share the journey of becoming the Horizon Festival boss with your friends.