Internalists in epistemology think that whether one possesses epistemic statuses such as knowledge or justification depends on factors that are internal to one; externalists think that whether one possesses these statuses can depend on factors that are external to one. In this chapter we focus on the relationship between externalism and epistemic relativism. Externalism isn’t straightforwardly incompatible with epistemic relativism but, as we’ll see, it is very common to hold that key externalist insights block or undermine some standard arguments for epistemic relativism. Our aim in this chapter is to give a broad overview of why externalism poses a problem for standard arguments for relativism. But we also want to discuss some – admittedly less developed – ways in which some externalist ideas might actually provide support for certain forms of epistemic relativism.