Grindavík is a fishing town situated in the Southern Peninsula district of Iceland, located near Þorbjörn on the far south-western part of the Reykjanes Peninsula. It stands on a lava field that erupted approximately 2,350 years ago from the Sundhnúkur crater chain and nearby volcanoes. As one of six communities on the peninsula situated on or near an eruptive fissure, it is among the few towns with a harbour on this coast, serving as a significant coastal settlement in the region.

The Book of Settlements records that Viking settler Molda-Gnúpur Hrólfsson arrived in Grindavík around 934, establishing early settlements alongside his sons. The town has been an important fishing station since medieval times, with fishing rights owned by the Bishop of Skálholt in the 13th century. Its modern municipal origins trace to Einar Einarsson building a shop there in 1897, and it was officially declared a municipality in 1974, evolving from a precarious survival economy into a structured community.

The town's geography is defined by its harbour, Hópið, created by an eruption 2,800 years ago, and the Leif the Lucky Bridge spanning the Álfagjá rift valley. Notable landmarks include the Blue Lagoon geothermal spa located five kilometres away, the Icelandic Saltfish Museum opened in 2002, and a lighthouse on the southern tip of the Hópsnes peninsula. The area also hosts the United States Naval Radio Transmitter Facility, featuring masts built in 1983 and 1993.

Cultural attractions include the Icelandic Saltfish Museum, which displays the history of salt fish production, and the sport club Ungmennafélag Grindavíkur with its stadium. The town is home to notable residents such as writer Guðbergur Bergsson and footballer Alfreð Finnbogason. Visitors are drawn to the Blue Lagoon and the unique geological features marking the boundary of the Eurasian and North American tectonic plates, alongside the town's rich maritime heritage.

As of 2025, the population is 1,246, with most inhabitants working in the fishing industry. The economy has shifted from dangerous traditional fishing trips to serious industrial development beginning in 1950, aided by safer access points created in 1939. The town has experienced significant disruption from volcanic eruptions and evacuations starting in November 2023, yet remains a functional community with ongoing infrastructure challenges and recovery efforts.