I'm having difficulty finding squash shoes, can I use tennis or badminton shoes instead?

Badminton or tennis shoes will suffice if the soles are non-marking. A lot of tennis manufactures sell squash shoes. I've worn Wilson and Dunlop shoes in the past, although I do compete competitively so I really do need the right kind of shoes, you should be fine without them.

Squash Shoes Australia

Please ignore a lot of the answers that say "why not"? The answer is yes they can but tennis shoes are heavier and slightly less flexible and hence not conducive for jump shots. The soles for hardcourts can be used on wooden badminton courts. However the tennis shoes used on clay/grass need to be avoided for badminton as traction will increase thereby increasing chances of injury due to the shoes staying where they are and your body moving when you make sudden movements. If you regularly play both games, i suggest you get specific shoes. I do not suggest using badminton shoes on tennis courts as the soles will wear out really fast on tennis hard courts.