Is there any school of thought or ideology that explicitly advocate suicide?

Question

I was curious if there's any ideology that does not criticize suicide or even advocate it?

Answer 1

For a survey about different views on suicide in the history of philosophy see the Stanford Online encyclopedy on suicide:

In contrast, the Stoics held that whenever the means to living a naturally flourishing life are not available to us, suicide may be justified, regardless of the character or virtue of the individual in question.

Presently exist in Europe several associations which support people who want to end their life, e.g., in Germany DGHS. Similar units exist in other European countries.

Answer 2

There is Seppuku.

The Samurai practised this as a way of ending their life, to avoid capture, or as a result of cultural shame. In the latter case, the act became ritualised, often perfomed in public.

Seppuku was also practised in World War II by Japanaese officers to restore honour for themselves or for their families.

Ending their life by their own hand was considered to be an honourable way to die.