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No. Nationals of other EU countries can access public healthcare in Portugal via the SNS with an S1 form. If, however, you’re a non-EU national, you’ll only become eligible to access free healthcare until you become a permanent resident. Up until that point, you will need comprehensive private health insurance to retire in Portugal.  

Outside of marrying a Portuguese national, the Portuguese Non Habitual Residence Programme (NHR) and the Golden Visa Programme are typically the preferred option for non-EU expats wishing to retire in Portugal.