Does Part 135 allow single-engine night IFR operations in a turboprop? Do the Part 135 rules allow single-engine turboprop night IFR Part-135 operations? If not, then all the night activities of current popular (and expensive) single-engine turboprops are by private or corporate owners and there are no commercial operations...!!! 

I understand certain single engine turboprops are allowed to fly IFR at night for hire in EU, but I am not sure about it. Your input is much appreciated.
Do the Part 135 rules allow single-engine turboprop night IFR Part-135 operations?


Yes, there is nothing preventing it provided the pilot is night current and the airports are suitable for night operation.

You can find the FAA's 135 general requirements here.