Doctor Who is a great tv series which has been on tv for years and years. If you want to watch Doctor Who online free then here are a few options (we checked these as recently as February 2019):

 

The yellow button shows that you can watch Doctor Who with a free Prime trial!

 

Just cancel before the 30 days is up and you don’t pay anything, simple. If you’re wanting to watch Doctor Who for free and in high quality right now, then a free trial with Amazon Video is your best option.