Rhinoceros (typically abbreviated Rhino or Rhino3D) is a commercial 3D computer graphics and computer-aided design (CAD) application software that was developed by TLM, Inc, dba Robert McNeel & Associates, an American, privately held, and employee-owned company that was founded in 1978. Rhinoceros geometry is based on the non-uniform rational B-spline (NURBS) mathematical model, which focuses on producing mathematically precise representation of curves and freeform surfaces in computer graphics (in contrast to a polygon mesh mathematical model).

Rhinoceros is used for computer-aided design (CAD), computer-aided manufacturing (CAM), rapid prototyping, 3D printing and reverse engineering in industries including architecture, industrial design (e.g., automotive design, watercraft design), product design (e.g., jewelry design) as well as for multimedia and graphic design.

Rhinoceros is developed for Microsoft Windows and macOS. A visual scripting language add-on for Rhino, Grasshopper, is developed by Robert McNeel & Associates.