Regionstog

thumb|Map of railway lines on the island of Zealand, Denmark. Red lines indicate lines operated by Regionstog.

Regionstog A/S was a Danish railway company responsible for train operation on three private railway lines in Region Zealand: the Tølløse Line, the East Line and the Lolland Line. It was established in 2009 when Vestsjællands Lokalbaner A/S, Østbanen and Lollandsbanen A/S where merged. It merged with Lokalbanen A/S in 2015 to form the railway company Lokaltog A/S. Regionstog had administrative offices in Maribo and Holbæk.