The Loiyumpa Silyel (Modern Meitei: "Loiyumba Sinyen"), also termed as the Loyumpa Silyel (Modern Meitei: "Loyumba Sinyen") or the Loiyumpa Shilyel (Modern Meitei: "Loiyumba Shinyen") or the Loyumpa Shilyel (Modern Meitei: "Loyumba Shinyen") or the Loyumba Sinyen (Old Manipuri: Loyampa Sinyen), is an 11th-12th century ancient Meitei language written constitution, regulated in the Ancient Kangleipak (early Manipur) during the rule of King Loiyumba (1074-1122 CE).

[1][1]: 304  Historically, it is the first written constitution,[2] and one of the well recorded Ancient Meitei language texts of the kingdom.

[3] It was replaced by the Manipur State Constitution Act 1947, that was functional until Manipur was merged into Republic of India on October 15, 1949.

[4] It includes the accounts of the distribution of the duties to the subjects of the king.

[3]: 306 [5] Its rules and regulations remains to be an authoritative work in the Meitei social system till the present day Manipur.