Guardamar del Segura (Valencian: [ˌɡwaɾðaˈmaɾ ðel seˈɣuɾa]), or briefly Guardamar, is a municipality of the province of Alicante located at the mouth of the river Segura in southern Valencia (autonomous community), Spain.

It is a Mediterranean resort, with a large pine forest abutting an 11-km-long white sand beach.

A Phoenician colony, called Herna by Roman geographer Avienius in his book Ora Maritima was the first settlement near the mouth of Segura river,[2] In Valencian, guardar means safekeeping and mar means sea, and this is another possible basis for its current name.

Guardamar hosts local festivals like Moros i Cristians (Moros y Cristianos), L'Encantà, and Fogueres de Sant Joan (Hogueras de San Juan), which commemorate its history.

In the latest municipal elections of May 2011, Carmen Verdú of the People's Party (Partido Popular) won the elections with an absolute majority, larger than the one the former mayor (María Elena Albentosa) had, while the opposition (Socialist Party) lost some of their popular support.