Can you set up find my iPhone after your iPhone was stolen?

No, you cannot set up Find My iphone after your iphone has been stolen. The feature needs to be enabled on the device beforehand, which allows you to track it using another Apple device or through iCloud. If your iphone was not set up with Find My iphone prior to the theft, you won't be able to locate it. However, you should report the theft to local authorities and your carrier.