Liis Tappo-Treial (née Tappo; born January 2, 1970 in Tartu) is an Estonian Miss and actress, Miss Estonia (1990), Miss Baltic Sea (1992).

In 1990, Liis Tappo was chosen as Miss Estonia. In the 1991 Miss Europe election, she came sixth. In 1992, she won the Miss Baltic Sea pageant. Liis Tappo-Treial came second in the 2001 Miss Globe election held in the USA.

Liis Tappo has played in the Estonian Drama Theater's production "Queen of Beauty" and in the film "These Old Love Letters" (1992) about the life of Raimond Valgre.