Disclosed herein are novel imidazole derivative compounds i.e., benzimidazole and aza-benzimidazole derivatives that act as DGAT1 inhibitors and can be useful in preventing, treating or acting as a remedial agent for hyperiipidemia, diabetes mellitus and obesity. Further disclosed are methods of treating various DGAT1 -related diseases, and the use of such imidazole compounds as described herein in the manufacture of a medicament for such treatment.