Finding literary agents for philosophical fiction can be a bit challenging. First, make a list of well - known literary agencies. Then, research each agency to see if they have any agents interested in this genre. Some big agencies have agents with diverse interests. You can also send out query letters to a select number of agents, but make sure your letter clearly outlines the philosophical aspects of your fiction and why it's unique. Don't forget to follow the submission guidelines precisely to increase your chances of getting a response.
You can start by looking at the acknowledgments section in published philosophical fiction books. Often, authors will thank their agents there, which gives you a lead. Additionally, professional writing organizations might have resources or lists of agents who deal with philosophical fiction. For example, some organizations focused on speculative fiction might also cover works with philosophical elements. Social media platforms can also be useful. Join relevant writing groups and ask for recommendations.