I am making a dish that requires Anaheim Peppers. They don't have them in my local store... what else can I use.
You need to substitute a mild pepper . . . be careful not to add something much hotter or you may change the whole concept of the dish . . . unless of course you are trying to kick up the heat a bit.
As suggested, a Poblano is the best substitute. Other names for Anaheim peppers are: California Green Chile; Long Green Pepper; and Chile Verde.
Poblanos are a good substitute, and are pretty common. any mild green pepper would probably be ok. (note: they also call anaheim peppers "new mexico", so maybe they are just labeled differently?)
Look for Cubano peppers or (less likely) Hungarian peppers.
Hungarian pointed pepper. It's strong:)