You can watch "One Tree Hill" streaming online on the following platforms:

• Hulu offers streaming of "One Tree Hill" with all seasons available

• Max (formerly HBO Max) also streams "One Tree Hill," with subscription plans starting at $9.99/month

• Joyn provides free streaming of full episodes of "One Tree Hill," available anytime

• Amazon Prime Video has the complete first season available for purchase or streaming

Other platforms like Netflix, Disney+, Paramount+, and others currently do not have "One Tree Hill" available

. In summary, the best options to watch "One Tree Hill" are Hulu, Max, Joyn (free streaming), and Amazon Prime Video (purchase or streaming).