Gamleby is the second largest locality situated in Västervik Municipality, Kalmar County, Sweden with 2,775 inhabitants in 2010.

The place was named after the move in 1433 Gamla Västervik, later Gamleby and is written 1456 Gamblaby.

[3] Only in the 19th century did the town begin to grow again when the railway (today called Tjustbanan) ran through the community and contributed to the growth of industries and workshops and as a central location for the surrounding countryside in Tjust.

The board farm, which in its heyday was the village's largest workplace, burned down in a big fire in 1920.

In the southern outskirts of the community, Hammarsbadet is about 25 minutes walk from Gamleby shopping center which is child-friendly with docks and jumping tower of five and ten meters, beach volleyball, playground and a barbecue area.