This chapter explores whether eschatology can serve as a shared horizon for Catholic and Shī‘ī believers. It situates the inquiry within the field of Catholic theology of religions, which seeks to value other spiritual traditions through the lens of Christian faith. The chapter critically engages with classical models of exclusivism, inclusivism, and pluralism, noting that some contemporary frameworks attempt to bridge these paradigms. Notably, the approach known as ‘interiorism’ affirms the truth present in other religions, starting from Islām, precisely through the recognition of Christian revelation. Rejecting both rigid inclusivism and relativistic pluralism, it promotes a nuanced theological stance grounded in Catholic tradition yet open to dialogical enrichment. While Islāmic theology of religions follows its own trajectory, it also raises parallel questions of truth, salvation, and coexistence. Rather than relying solely on abstract models, the chapter highlights the significance of lived interfaith experiences, such as the Wings of Unity—a Shī‘ī-Catholic initiative that exemplifies an ethical-practical and religious-mystical approach. This model can be described as a ‘dialogical interreligious mystical theology,’ where dialogue and theological reflection coexist in hermeneutical circularity. The chapter also surveys contemporary Catholic eschatological textbooks, observing an emerging interest in Islāmic eschatology. Yet, the relationship between the eschatological roles of Jesus and the Mahdī remains largely underexplored. After justifying the relevance of the expression ‘eschatological unity,’ the chapter proposes it as both a hermeneutical key and an ethical orientation, fostering theological hospitality, mutual esteem, and a shared vision of humanity’s final destiny in the One God.