Przedsiębiorstwo Komunikacji Samochodowej (commonly abbreviated PKS, can be translated as Motor Transport Company) is a major Polish enterprise dealing with inter-city public transport using coaches.

Until 1989 it had a monopoly on suburban and interurban bus transport in Poland.

After the fall of communism, PKS was divided into 176 local operations.

The first one occurred in 1978, when two buses fell 18 m from a bridge into the Żywiec Lake, killing 30 people.

This remains the worst road disaster in Poland's history.