Smalspårsjärnvägen Hultsfred–Västervik, Heritage railway in Småland, Sweden.

The Smalspårsjärnvägen Hultsfred-Västervik is a narrow-gauge railway with 891-millimeter track width running 71 kilometers through forests, lakes, and farmland in eastern Småland. The line connects two smaller towns and passes through varied landscapes with preserved stations and historical railway buildings.

The Hultsfred–Westerviks Jernväg (HWJ) opened the line in 1879 on the initiative of the town of Västervik; Hultsfred already had a standard-gauge connection from 1874. HWJ was taken over by Västervik–Åtvidaberg–Bersbo Järnväg in 1914, and in 1924 the merged company became Norsholm–Västervik–Hultsfreds Järnvägar. The state took over in 1949, the last passenger train ran on 19 August 1984, and freight ended after a derailment at Rödsle on 13 December 1985.

Since 2003 the Tjustbygdens Järnvägsförening has run summer museum services with YBo5p railcars along the whole line and steam-hauled trains on parts of it, plus charter trains and event services during the rest of the year. The association has operated trains here since the early 1980s, already in SJ days.

The railway operates throughout summer months with multiple daily departures, though morning hours tend to be less crowded. Visitors should bring weatherproof clothing and allow extra time to explore the stations and surrounding countryside along the route.

The 891 mm gauge equals three Swedish feet, and the line is Sweden's first railway protected as a listed building complex. A lesser-known consequence of the narrow loading gauge: the Vituddens Kanotvarv in Västervik built its kayaks to a maximum length of 520 cm so they could be shipped by rail, a measure later adopted internationally for racing kayaks.