The current paper aims to search and summarise the current literature on the linguistic aspect of the Orang Asli languages in Malaysia. Following the PRISMA Statement (Preferred Reporting Items for Systematic Reviews and Meta-Analyses), a systematic review was conducted with a particular focus on three main groups of the Orang Asli in Peninsular Malaysia: (1) Negrito; (2) Senoi; and (3) Aboriginal Malay. Of 158 works found, 58 were excluded (irrelevant); 100 were relevant and included in the review. Works published between 2009 to 2019 were selected and categorised into journal articles (n = 51), books (n = 28), undergraduate/postgraduate theses (n = 8), conference proceedings (n = 8), and chapter in book (n = 5). Of these works, the Negrito is widely discussed (n = 94), followed by the Senoi (n = 90), and then the Aboriginal Malay (n = 76). The sub-areas of these linguistic studies include phonology, morphology, sociolinguistics, syntax, semantics, lexis, and grammar. With regard to language documentation, to date, only ten projects are found dealing with the digital repository of the Orang Asli languages. Further research on linguistics seems warranted for the preservation of these languages.