Mesophilus may refer to:
Brassicibacter mesophilus, species of bacteria Galbibacter mesophilus, species of bacteria Gelidibacter mesophilus, species of bacteria Mechercharimyces mesophilus, species of bacteria Nocardioides mesophilus, species of bacteria Streptomyces mesophilus, species of bacteria Tepidibacter mesophilus, species of bacteria Terrimesophilobacter mesophilus, species of bacteria