Information handling systems (IHS) and methods are provided to automatically synchronize operating system (OS) and boot firmware languages. In one embodiment, a method may detect a change in an active OS language from a first language pack to a second language pack, notify the boot firmware that the active OS language was changed, and provide an identity of the second language pack to the boot firmware during OS runtime. When the IHS is subsequently rebooted, the active boot firmware language may be synchronized to the active OS language. In another embodiment, the method may detect a change in an active boot firmware language from a first language pack to a second language pack, notify the OS that the active boot firmware language was changed, and provide an identity of the second language pack to the OS during a pre-boot phase. When the OS is subsequently booted, the active OS language may be synchronized to the active boot firmware language.