Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
There is consensus among jurists that selling impermissible (haram) substances is unlawful in Islam. So, selling, buying, or owning any kind of pork or ham is forbidden.
In his response to your question, Prof. Dr. Monzer Kahf, Professor of Islamic Finance and Economics at Qatar Faculty of Islamic Studies, states:
It is very abnormal that the majority of pizza includes pork; that is a pork pizza, not pizza. Regardless, sale of pork is haram and franchising it is also haram.
It is definitely not permissible for a Muslim to sell anything not permissible in the Shari`ah or to own a store which has such things. The price collected from pork sale is also haram, all the price not only the profit.
Almighty Allah knows best.
Editor’s note: This fatwa is from Ask the Scholar’s archive and was originally published at an earlier date.