Spiro[2.5]octane-1-carboxylic acid is primarily used in organic synthesis as a building block for more complex molecules. Its unique spirocyclic structure makes it valuable in the development of pharmaceuticals, particularly in creating compounds with specific three-dimensional shapes that can interact with biological targets. It is also employed in material science for designing polymers and coatings with enhanced properties, such as improved stability or flexibility. Additionally, its carboxylic acid group allows for further functionalization, making it versatile in chemical reactions.