This application discloses anti-P-cadherin antibodies, antigen binding fragments thereof, and antibody drug conjugates of said antibodies or antigen binding fragments. The invention also relates to methods of treating cancer using the antibodies, antigen binding fragments, and antibody drug conjugates. Also disclosed herein are methods of making the antibodies, antigen binding fragments, and antibody drug conjugates, and methods of using the antibodies and antigen binding fragments as diagnostic reagents.