G. H. Lewis, or George Herbert Lewis, was a notable British philosopher and logician known for his contributions to the field of philosophy in the early 20th century. He is particularly recognized for his work on the philosophy of language and logic, influencing later thinkers in these areas. His writings often explored the relationship between language, meaning, and reality. Lewis is also known for his involvement in the development of modal logic, which examines the concepts of necessity and possibility. His ideas have had a lasting impact on both philosophy and mathematical logic, making him a significant figure in the study of these disciplines.