Provided herein are antibodies, or antigen binding portions thereof, that bind to T-cell immunoglobulin and mucin-domain containing-3 (TIM3) protein. Also provided are uses of these antibodies, or antigen binding portions thereof, in therapeutic applications, such as treatment of cancer. Further provided are cells that produce the antibodies, or antigen binding portions thereof, polynucleotides encoding the heavy and/or light chain regions of the antibodies, or antigen binding portions thereof, and vectors comprising the polynucleotides encoding the heavy and/or light chain regions of the antibodies, or antigen binding portions thereof.