| Oarray | Array. |
| Oatomarray | Atom array object. |
| Oattractor | Particle attractor. |
| Obackground | Background. |
| Obase | Base object. (BaseObject) |
| Obasedeform | Base deform object. |
| Obend | Bend deformer. |
| Obezier | Bezier NURBS. |
| Obone_EX | Deprecated (Bone). |
| Oboole | Boolean. |
| Obulge | Bulge deformer. |
| Ocamera | Camera. (CameraObject) |
| Ocapsule | Capsule object. |
| Ocharacter | Character object. |
| Ocmotion | CMotion object. |
| Ocone | Cone object. |
| Oconnector | Connector object. |
| Ocube | Cube object. |
| Ocylinder | Cylinder object. |
| Odeflector | Particle deflector. |
| Odestructor | Particle destructor. |
| Odisc | Disc object. |
| Oenvironment | Environment. |
| Oexplosion | Explosion deformer. |
| Oexplosionfx | Explosion FX object. |
| Oextrude | Extrude NURBS. |
| Offd | FFD. |
| Ofigure | Figure object. |
| Ofloor | Floor. |
| Oforeground | Foreground. |
| Oformula | Formula deformer. |
| Ofractal | Fractal object. |
| Ofriction | Particle friction. |
| Ogravitation | Particle gravitation. |
| Oheadphone | Headphone. |
| Oinstance | Instance. |
| Ojoint | Joint object. |
| Olathe | Lathe NURBS. |
| Olight | Light. |
| Oline | Line. |
| Oloft | Loft NURBS. |
| Oloudspeaker | Loudspeaker. |
| Omelt | Melt deformer. |
| Ometaball | Metaball. |
| Omicrophone | Microphone. |
| Onull | Null object. |
| Ooiltank | Oil-tank object. |
| Oparticle | Particle emitter. (ParticleObject) |
| Oparticlemodifier | Particle modifier. |
| Oplane | Plane object. |
| Oplatonic | Platonic object. |
| Oplugin | Plugin object - pass the plugin ID. |
| Opluginpolygon | Polygon plugin object. |
| Opoint | Point object. (PointObject) |
| Opolygon | Polygon object. (PolygonObject) |
| Opolyreduction | Polygon reduction object. |
| Opyramid | Pyramid object. |
| Orelief | Relief object. |
| Orotation | Particle rotation. |
| Osds | SDS (HyperNURBS) object. (SDSObject) |
| Oselection | Selection object. |
| Oshatter | Shatter deformer. |
| Oshear | Shear deformer. |
| Oshowdisplacement | Show displacement. |
| Osinglepoly | Single polygon object. |
| Oskin | Skin deformer. |
| Osky | Sky. |
| Osphere | Sphere object. |
| Ospherify | Spherify object. |
| Ospline | Spline object. (SplineObject) |
| Ospline4side | 4-sided spline object. |
| Osplinearc | Arc spline object. |
| Osplinecircle | Circle spline object. |
| Osplinecissoid | Cissoid spline object. |
| Osplinecogwheel | Wheel spline object. |
| Osplinecontour | Contour spline object. |
| Osplinecycloid | Cycloid spline object. |
| Osplinedeformer | Spline deformer object. |
| Osplineflower | Flower spline object. |
| Osplineformula | Formula spline object. |
| Osplinehelix | Helix spline object. |
| Osplinenside | N-sided spline object. |
| Osplineprimitive | Spline primitive. |
| Osplineprofile | Profile spline object. |
| Osplinerail | Spline rail object. |
| Osplinerectangle | Rectangle spline object. |
| Osplinestar | Star spline object. |
| Osplinetext | Text spline object. |
| Ostage | Stage. |
| Osweep | Sweep NURBS. |
| Osymmetry | Symmetry object. |
| Otaper | Taper deformer. |
| Otorus | Torus object. |
| Otube | Tube object. |
| Oturbulence | Particle turbulence. |
| Otwist | Twist deformer. |
| Owave | Wave deformer. |
| Oweighteffector | Weight effector. |
| Owind | Particle wind. |
| Owinddeform | Wind deformer. |
| Oworkplane | Work plane. |
| Owrap | Wrap deformer. |
| Oxref | XRef object. |