Multilingualism is not only limited to people or communities using multiple spoken languages, and complex linguistic diversity of signing communities is often seen among signers. This chapter focuses on the special type of multilingualism of children who are acquiring both sign language(s) and spoken language(s) from their linguistic environment, also referred to as bimodal multilingualism. As sign languages and spoken languages are partly produced and received in two different modalities (visual-gestural and vocal-auditory), the multilingualism of these children involves two different modalities. This chapter discusses the bimodal multilingualism of hearing and deaf children who are acquiring both sign and spoken languages. The chapter describes the multifaceted linguistic landscape and environment of bimodal multilingual children, the access of bimodal multilingual children to different languages, and the use of different languages in a variety of social contexts. Additionally, the chapter illustrates the process of bimodal multilingual language acquisition and challenges to maintain the acquired language abilities as heritage language users, as well as the attainments and usage of hybrid linguistic resources.