There are currently no operational narrow-gauge railway lines in Croatia. In some cities there are still metre-gauge tram networks.

Metre gauge 1,000 mm (3 ft 3+3⁄8 in)

Osijek–Donji Miholjac, 51 km, closed 1970.

Bosnian gauge 760 mm (2 ft 5+15⁄16 in)

• Parenzana railway, Trieste (Italy) – Capodistria–Koper (Slovenia)–Parenzo (Poreč, Croatia). Dismantled, in formerly Italian territory. Single track, 122,88 km.
• Samoborček railway, Zagreb–Samobor via Podsused. Single track, 19 km. Later extended to Bregana, now dismantled.
• The former Steinbeis railway starting in Knin and crossed the border to Bosnia and Herzegovina, replaced with the standard-gauge "Unska pruga" route in 1948.
• Sinjska rera [hr] railway, Split–Sinj, dismantled 1963
• Railway from Gabela to Zelenika
  • Branch: Uskoplje–Dubrovnik–Gruž

Decauville 600 mm (1 ft 11+5⁄8 in)

• Raša (Štalije)–Mine, single track, ~ 7 km
• Plomin Luka to mine, single track, ~12 km

Metre-gauge trams

Current

• Osijek tram system
• Zagreb Tramway

Former

• Dubrovnik tram
• Opatija tram
• Trams in Pula
• Trams in Rijeka