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The Grande Prémio de Atletismo da Associação de Moradores 18 Maio is a road running race held in Carnaxide, Oeiras, Lisbon. It is part of the 43rd Troféu Câmara Municipal de Oeiras – Corridas das Localidades series and organized by Associação de Moradores 18 Maio with support from the Oeiras City Council.

The event offers multiple race distances including 7.38 km, 4.34 km, 3 km, 1.45 km, and two 0.6 km courses, all on flat terrain with no elevation gain or loss. The race is scheduled for May 18, 2026.