Europe's Existential Dilemma: To Be or Not to Be an American Vassal () is a 2019 book by the Swiss journalist and politician Guy Mettan. Clarity Press published it in English translation in 2021.
Mettan examines what he regards as the major problems of contemporary Europe: the absence of democracy, a supremacy of economic interests over legal and political matters, ever expanding inefficient institutions, the inability to secure peace, and an increasingly encroaching subordination to the United States. Mettan portrays a possible European choice between increased irrelevance as an American vassal, or the creation of institutions that counter European decline, take advantage of China's challenge to American hegemony, and establish a democratic, sovereign and unified Europe.