Here's my itinerary for my trip next week: Flying DEN to FRA with a 5 hour layover at the Lufthansa first class terminal. Then I'm flying to LHR. Four days later I'm flying to BCN. My question is will I receive 3 passport stamps since I'm arriving at a Schengen country, then flying to a non-Schengen country, and then flying to a Schengen country?

Should be 6 but sometimes they don't stamp in EU. So in essence could be only 1 UK entry and 1 exit.

If you're transiting at a Schengen country, you won't receive a stamp, as all inbound/outbound gates are located in a single area beyond immigration control. FRA is a bit odd in that terminals are separated by carriers & partners instead of destination, which means you might have to walk a bit but as long as you don't exit the non-Schengen area, you won't have to go through customs though you probably will have to go through security screening if your outbound gate is in another "pier."

In this case, you will receive a passport stamp on these occasions in this particular order according to your trip:
1. entry into UK
2. exit UK
3. entry into Schengen
4. exit Schengen

I'll be leaving the main terminal to walk to the Lufthansa First Class Terminal.

The UK does not do exit checks only entry.

H

No "probably" about having to undergo another security screening at FRA. If you arrive from the USA you have to re-clear security.

If you enter the Schengen zone and walk to the FCT, then you'll get:
1. Entry stamp at FRA
2. Exit stamp at FRA
3. Entry stamp in LHR
4. Entry stamp in BCN
5. Exit stamp in your exit Schengen airport.

FRA usually stamps foreign non-residents, LHR always stamps, BCN always stamps (in my experience).

If BCN is similar to MAD, you may want to watch where they stamp. Exiting MAD, the Spanish passport control officer just stamped the inside of the back cover of our passports.

The UK doesn't stamp the passports of out-going passengers, even when there is a passport check. More often than not, however, there is no exit passport check from the UK.

I did not last time I transited FRA. Upon arrival from EWR (continuing to KBP) we were deposited directly into the terminal after showing our onward BP to an agent at the top of the jetbridge.

I know this is an older thread but quick question. Does one get stamps when traveling between countries in the Schengen zone?

No. Just like you don't get stamps when traveling from Illinois to New York. (Well, sort of a bad example but still correct)

You can ask for a stamp at any entry point if you wish. They normally smile and say yes. I have a UK passport and don't need stamping into any EU state but sometimes I ask for one as a souvenir. Only at AMS did they say no.

However, you can't really ask for a stamp if you're not passing over a border that has immigration control at it. And in any case non-EU/EEA/Swiss people don't want extraneous exit or entry stamps from Schengen countries, because the stamps might not tally properly, which could cause problems on final exit from the Schengen area.

Technically, EU countries are not supposed to stamp EU passports because (it is said) the stamp implies immigration permission to enter or leave the country and no permission is needed from an immigration officer. (I must say that I'm not quite why a passport stamp that that gives only the date, the point of entry or exit, and the mode of travel could be said inevitably to imply permission rather than simply facts...)

As you say, though, many passport control officers will oblige with a stamp if asked, particularly (though not only) in a child's passport.