The Embassy of Chile is close to the Novatel Hotel in Bangkok. There is not public transport close to the embassy however you can get off at the skytrain BTS Asok Station ot the BTS Phrom Phong Station or the subway system at the MRT Sukhumwit. The embassy can assist you with marriage registration, issue a new passport or register a birth or death in Thailand.
If you are looking at visiting Thailand then you can contact the Thai embassy in Chile for more information before you come to Thailand. The contact details for the embassy is listed below with a map and contact details. If you want to know more about Chile then see here.
Embassy of Chile in Bangkok, Thailand
83/17 Vitayu Place
Soi Vitayu 1 Wireless Road
Phone: 66(2) 251 9470 : 66(2) 251 9471 : 66(2) 251 9472
Fax: 66(2) 251 9475