Orangutan Diaries is a nature documentary series on the BBC, which follows the lives of Bornean orangutans in the care of Lone Drøscher Nielsen, a member of the Borneo Orangutan Survival (BOS) foundation. The program tries to detail the threat that the orangutans face in day-to-day life. The presenters Michaela Strachan and Steve Leonard follow the careers of the orangutans daily to see what the centre has to deal with.

The centre was founded in 1994, a year after Lone Dröscher Nielsen permanently moved to Borneo. She could see what effect the palm oil plantations were having on the orangutans, so then founded the Nyaru Menteng Orangutan Reintroduction Project, which now is the largest ape rescue project in the world.

The first series aired on BBC One in April 2007 and the second series on BBC Two in March 2009. Both series are available as DVDs