Jan Kryštof Liška (German: Johann Christoph Lischka; c. 1650 – 23 August 1712) was a Czech Baroque painter.
Since 1689 Liška worked mainly, besides his native Silesia, in Bohemia proper – especially in Prague although there he had lifelong disputes with local artist's guild, while he lived in the shadow of his famous stepfather (thus sometimes nicknamed "Willmann, Jr.").
Among his best known works include the altarpiece Stigmata of St. Francis (1701) located in the Red Star Crusaders' motherhouse church in the Old Town.
In Kamieniec Ząbkowicki (Kamenz) in the Church of the Assumption he painted the images Death of St. Benedict and St. Scholastica During the Coronation (1708).
Liška's influence is evident particularly in works of his disciple, fresco painter Václav Vavřinec Reiner, it also can be traced at style of Petr Brandl.