The book "Finsler and Lagrange Geometries" offers a comprehensive collection of contributions that emerged from international conferences on Finsler, Lagrange, and Hamilton geometries. These conferences, held in various countries, have promoted significant advancements in geometry research and led to the publication of important reference works. This collection is the result of the International Conference that took place in August 2001 at Al.I.Cuza University in Iași, Romania. This event was not only a tribute to the renowned geometer Prof. Dr. Peter Louis Antonelli but also a platform for the exchange of ideas and research findings among professionals from different countries. The contributions cover a wide range of topics and provide valuable insights into current developments and challenges in geometry.