Can a non-Jewish foreigner legally retire in Israel?

Yes, but there is no dedicated retirement visa. Non-Jewish foreigners can legally reside in Israel long-term through the A/5 temporary residency permit, family-based residency (as a spouse or parent of an Israeli citizen), or other qualifying visa tracks. The process is more complex than Aliyah, requires periodic renewals, and usually benefits from legal assistance. It is entirely achievable with proper planning.