Abstract: A new and innovative collapsible and portable toilet chair is provided that may, for example, be used for potty training a child. The toilet chair includes a base portion and a seat portion that are each movable between an extended state for use and a collapsed state for portability. The seat portion may be removable from the base portion. The toilet chair can remain a single unit and is compact when in the collapsed state. From the collapsed state, the toilet chair may be pulled outward into the extended state. A bag for collecting a child's waste may be positioned on the seat portion and supported by a flexible support member extending from the seat portion. The toilet chair can be positioned on the ground anywhere and used anytime a child needs a toilet. The toilet chair is therefore beneficial for traveling outside of the home with a child.