Is it possible to have citizenship in Australia, New Zealand, Canada, the United States and the United Kingdom simultaneously?

I'm already a citizen of Australia, the USA and the UK and given enough time and eligibility for Permanent Residence, it would also be possible to add Canada to that list. NZ too - it's easy for Australian citizens but you must live there for 5 years to be eligible. All 5 of those countries allow their citizens to have multiple citizenships.

If you were starting from just having your Australian citizenship, it would take an absolute minimum of 20 years and probably twice that long IF (and it's a very big if) you had the high level of skills that would be required to get PR and then you need to meet citizenship residence requirements (usually 5+ years) in each country.

Don't know if Iran allows dual/multiple citizenship, but getting citizenship there would take at least another 5 or so years. You don't become a citizen just because you marry an Iranian. I'm not sure why you'd bother though!

There seems to be no rhyme or reason to this. Citizenship aren't Pokemon, you're not there to collect them all. Many places will not appreciate multiple citizenships and force you to choose which ones to keep. This is *especially* the case if you somehow become an Iranian citizen by marriage.

Your eventual marriage will not make you a citizen of Iran, marriage in itself is not a way to attain citizenship, you would legally need to live/work in Iran for a number of years before you could apply for citizenship.

As for the other countries, basically the same legally living and working in each country for at least 5 year before you could even start the process of citizenship and legally being able to work in any of them in the first instance would mean you need to have something to offer they want/need, so a high level STEM degree and years of work experience in the same field.... only then are you in a position to look for a registered employer who is offering a high level job who if you got the job would sponsor the work visa, so it is nothing to do with what you want, it is about what can you offer any of them want.

10 years to get that high level STEM degree, plus a couple of years to get experience,another 2 years to find the job/get the sponsored visa, 5-7 years before you are in a position to apply for citizenship of the country you are living in, so 20 years to get one if everything is in place, then another 10 years for each of the others by that time you will be well past retirement age

Wow.....that would be like winning the lottery 5 times for an immigrant.....!

The likelihood is extremely low.