An inspector window is a type of computing window that shows current parameters of a selected object and allows these parameters to be changed on-the-fly.

For example, in a vector graphics application the user creates drawings out from elements such as lines, rectangles and circles. When such an element is selected on the page, an inspector will show the current size and absolute position on the page of this element with numbers. The user can then change those numbers to change the size or position of the object on the page.

A inspector window is a type of palette window.