3100 series or 3100 class train may refer to:
Japanese train types Hakone Tozan 3100 series, an electric multiple unit train Hankyu 3100 series, an electric multiple unit train Keisei 3100 series, an electric multiple unit train Meitetsu 3100 series, an electric multiple unit train included Odakyu 3100 series NSE, an electric multiple unit train
Other CP Class 3100 GWR 3100 Class MRTC 3100 class, a light rail vehicle Queensland Railways 3100/3200 class
See also 3100 (disambiguation)