This Element explores the relationship between monotheism and relativism. Over the last two decades, emerging relativist theories have been extensively developed and debated within the fields of philosophy. How does monotheistic theology relate to relativism, especially to relativism about truth? Given that truth relativism contends that beliefs and propositions are invariably only relatively true, it appears to conflict with traditional monotheism, which asserts the absolute truth of God's existence. This book examines the compatibility of relativist positions with monotheism, emphasising the need to differentiate among the diverse forms, types, and domains of relativism. It presents a nuanced stance on the relationship between relativism and monotheism.