Given the importance and significant position of religious eulogies, many studies have been conducted so far on the thematic and rhetorical dimensions of this category of literary works in Arabic and Persian literature. However, the English poems composed for eulogizing the eighth Imam of the Shiites (AS) have not been examined and analyzed so far. The aim of the current study is a comparative analysis of the themes and literary devices of Arabic and English eulogies on Imam Reza (AS). This study focused on the poems composed in the recent years. The current study is qualitative in terms of approach and in terms of data collection method, it is a library study. The results of this study showed that Arabic and English poets have proposed common themes in their poems, such as the innocence of the Imam (AS) and the oppression of Mamun, the nobility and dignity and good characteristics of the Imam, the love of visiting the province of the eighth Imam, and the enjoyment of his intercession for forgiveness and approaching God. On the other hand, the main literary devices used in Arabic and Persian eulogies are semantic devices and are used in the direction of effectively conveying the themes of the poem. In comparison, the themes of Arabic eulogies have been richer and more comprehensive than English eulogies, which confirms the wider knowledge of Arab poets about the characteristics of Imam Reza (AS) and the events of his lifetime.