Khun Ying Jamsai Silpa-archa (, , ; born 20 April 1934), née Lekhawat (, ), is the widow of Banharn Silpa-archa, the 21st Prime Minister of Thailand and Thai Nation Party Leader. They have three children: one son, Varawut (married to Suwanna Raiwin), and two daughters, Kanchana and Parichat.
Jamsai graduated from Phadungsil School in 1944 and graduated from Sanguan Ying School in 1947. She was a founder of Banharn-Jamsai Silpa-archa Foundation to provide educational opportunities to students in Suphanburi province.