Competitor as an interested party

Answer:

Competitor can't be considered as an interested party because his interests are colliding with the interests of the organization. For example, Competitors are interested in gaining bigger part of the market so they would like the organization to provide low quality products by higher price and this is definitely not the kind of need and expectation you want to meet.

For more information about identification of interested parties, see: How to determine interested parties and their requirements according to ISO 9001:2015 https://advisera.com/9001academy/blog/2015/11/10/how-to-determine-interested-parties-and-their-requirements-according-to-iso-90012015/