What type of switches will I need to turn a light on from three different locations?

Two of the locations will use a three-way switch and the other location will need a four-way switch.

It can be helpful to have some guidance when installing new switches.

Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.