The international definition of 'Nature Photography'
From 1 January 2015 the International Federation of Photographic Art (FIAP), the Photographic Society of America (PSA) and the Royal Photographic Society (RPS) have all used the same definition for Nature and Wildlife photography in the exhibitions that they approve. That definition is also be used by many national photopgraphic organisations such as the Australian Photographic Society (APS).
You can read the Nature definition on this page.
Interpreting the 'Nature Photography' definition
The FIAP/PSA Nature photography definition can be a challenge to interpret, so I have prepared a detailed guide that you can follow when capturing and editing images that you plan to enter in Nature or Wildlife categories of competitions (exhibitions).
You can download a detailed interpretation of the Nature definition here.
Ethics in Nature photography
Basic guidelines for ethic practice in nature photography are given here.