There are several ways to include a window over your bathtub and not have people see into the bathroom.

One is to install a window made of rippled and/or frosted glass. You will want to be careful to check the window you are considering before making a choice. There are some frosted windows that are a bit too transparent for the needs of many homeowners.

A second option is to use glass block windows. These are both popular and difficult to see through. Yet another option would be to install a stained glass window. This can create both a focal point of your design and keep people from seeing in.

Another option might be to choose a window with an interior blind between two panes of glass. This allows you to close the blind when you are bathing, allows natural light to enter at other times, and eliminates the need to clean the blind. Finally, you can simply use a blind, shutter or shade.