Are US citizens required to be vaccinated to enter Portugal?

You need proof of a negative covid test to enter, if not, or even if vaccinated. Everyone needs a negative test to enter the country. Things are changing as the variants change. I read on here that mask mandates were lifted 4/22 for indoors, but still required on trains/buses.

Its best to check with your airline as they will require that information as you board (Covid test results). The US vaccination records were / are not accepted in the EU. Our cards do no good there.

Does anyone know why there isn't reciprocity with Portugal on vaccine passes when we seem to have it with most (all?) other EU countries?

I think portugal’s position is if we make their citizens do the test to come here, they make ours do it to go there. Hence, reciprocity.

I think it's for safety and the Portuguese health system does not have the bulk of available beds like in USA. I absolutely agree with this practice as we are guests in someone's country and rather be safe !! Whether you ate vax or not, you need to show a negative test before entry. What EU countries have an agreement with USA ? I am not aware of any that do... please let me know! :-)

I've been checking the US embassy website for Portugal and up until today they've kept saying you had to have a test. Now - as of 22 Apr it says this vague and not totally helpful advice:

Testing / Vaccination requirements for entry: All passengers 12 years old older must present EITHER

EU Digital Vaccination Certificate OR
No specific guidance exists indicating if US CDC vaccine card are accepted for proof of vaccination. As such U.S. Embassy Lisbon strongly recommends all U.S. citizens travelling from the United States to Portugal follow option 2, present a negative COVID 19 test before boarding (see below)
Negative COVD Test
PCR / NAAT test 72 hours before boarding or
Rapid Antigen / TRAg test 24 hours before boarding.

To be on the safe side, get a test . No worries if things change, especially with a non vax person !

You do need to take a test to fly into mainland Portugal based on the most recent updates I have read.
Not Madeira oddly, which is where I just was last week.

You don't need proof of Vaccination to enter the country.

We brought our CDC Vax cards with us but were never asked to present them.
Masks were required to be worn at all times in all indoor places in Madeira (everywhere indoors unless in the act of eating and drinking)
The type of mask did not matter.

My understanding is the hotel you are staying in, restaurant or similar indoor venue has the right to ask for a Vax card/proof and could deny service/entry if you don't have one but likelihood of being asked seems to be lessening by the day.
I also think the acceptance of the CDC card vs. an official EU pass if you were asked is likely easier by the day.
Just my recent experience, your mileage may vary

Personally I would recommend being vaccinated before traveling internationally though.

We arrived in Lisbon today. We flew ATL-AMS-LIS and were never asked to present our negative test results!

Abby O - ATL-AMS-LIS - I’m guessing you were flying Delta. You did not show CDC card nor negative test result when checking in at Delta in Atlanta?
I flew ORD to LIS in September. Delta required all passengers to provide proof of vaccination/recovery and negative test at check in. No advance boarding passes issued… available only at check in counter, even if not checking bags.
I’ll be flying in June on Iberia ORD - MAD- LIS. I am anticipating the same - documentation required at check in counter in order to be issued a boarding pass

I am fully vaxx’d American currently in Spain. Do I need a negative test to fly from Spain to Portugal

I believe you do as you don't have the EU passport for vax. Best to check with airline. Easier if you are driving over border.

Test still required as of right now: https://www.visitportugal.com/en/content/covid-19-measures-implemented-portugal.