A category influencer is someone who specializes in a specific niche and is recognized for their expertise or strong connection to that topic. They position themselves as experts within their field and build a high level of trust and credibility with their audience. While they may not have the largest following, they often generate strong engagement within their niche.

An example is Dr. Mark Hyman in the health and nutrition space. As a recognized expert in functional medicine, he reaches a highly targeted audience that values his knowledge and recommendations, making him especially valuable for brands in that category.