Will Navidson is a fictional character from the novel "House of Leaves" by Mark Z. Danielewski. He is a photojournalist who moves into a house with his family, only to discover that the interior dimensions of the house are larger than its exterior. This mysterious phenomenon leads him to document his experiences, exploring themes of perception and reality. Navidson's journey is marked by his attempts to understand the strange occurrences within the house, which ultimately affect his relationships and mental state. His story is intertwined with the exploration of fear, love, and the nature of home, making him a complex and relatable character.