Lotus 1-2-3 sī goân Lotus (āu--lâi sio̍k IBM) kong-si ê chhì-sǹg-pió nńg-thé. I sī tùi IBM PC lâi kóng chhī-tiûⁿ siōng siāng chá ê sat-chhiú èng-iōng (killer application), tī 1980 nî-tāi chin liû-hêng.