The Municipality of Šempeter–Vrtojba (Slovene: Občina Šempeter - Vrtojba, Italian: Comune di San Pietro-Vertoiba) is a municipality in Slovenia. The municipality comprises the town of Šempeter pri Gorici and the adjacent village of Vrtojba.
Both settlements used to be suburbs of town of Gorizia until 1947, when they become part of Yugoslavia while Gorizia remained a part of Italy. They have had a separate urban development since then. Nowadays, the Municipality of Šempeter–Vrtojba forms a single continuous urban area with the neighbouring towns of Nova Gorica and Gorizia. Since May 2011, these three municipalities have been joined in a common trans-border metropolitan zone, administered by a joint administration board.
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