The Ramdasia were historically a Sikh, Hindu sub-group that originated from the caste of leather tanners and shoemakers known as Chamar
Ramdasia is a term used in general for Sikhs whose ancestors belonged to Chamar caste. Originally they are followers of Guru Ravidass who belongs to Chamar community. Both the words Ramdasia and Ravidasia are also used inter changeably while these also have regional context. In Puadh and Malwa, largely Ramdasia in used while Ravidasia is predominantly used in Doaba.
Ramdasia Sikhs are enlisted as scheduled caste by Department of Social justice, Empowerment and Minorities- Government of Punjab. On Department's list of Scheduled Caste, this caste is listed on serial number 9 along with other Chamar caste synonymous such as Ravidasia, Jatav and so on.
During World War I the single-battalion regiments of the Mazhabi and Ramdasia Sikh Pioneers – the 23rd, 32nd and 34th Pioneer Regiments – were expanded to comprise three battalions each. These units served in Egypt, Europe, Mesopotamia and Palestine and performed well. The 1/34th Sikh Pioneers were awarded the title of "Royal".
The Ramdasia Sikhs, together with the Majhabi Sikhs, were recruited to the Sikh Light Infantry regiment (SLI) after its formation in 1941. The Sikh Light Infantry has always been a "single class" regiment in the parlance adopted from the British Raj era. This means that it recruits only from one demographic, which in this instance means the Ramdasia Sikhs and Mazhabi Sikhs. Indeed, the SLI was initially called the Mazhabi & Ramdasia Sikh Regiment. Despite unwillingness among some policy makers, the British had to abandon their traditional distinction between martial and non-martial races during the Second World War. This was necessitated by the need for more recruits than could be supplied by those communities upon which they usually relied, such as the Jat Sikhs, Dogras and Punjabi Musalmans. In addition, indiscipline among Jat Sikhs caused by their concerns regarding a post-war division of India was another reason to prefer recruitment of new classes.