Can non-Catholics become Saints?

Are Catholics the only ones considered for Sainthood by the Catholic Church? Has there ever been any non-catholics named Saints by the Catholic Church or by a sitting Pope?

The following links should assist you in better understanding the Catholic Church’s teaching on who She canonizes. If you have any further questions or concerns that are not
Recommended Reading:
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Will Martin Luther be made a Catholic saint?**
]* Aren’t We All Saints? Canonizing Saints Questioned… **
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