The Christian Democratic Union (Spanish: Unión Demócrata Cristiana, UDC'), formerly known as Popular Democracy (Spanish: Democracia Popular, DP) was a Christian democratic political party in Ecuador.

It reached its first great success in 1978 when party member Osvaldo Hurtado became the running mate on the successful presidential ticket of Jaime Roldós of the Concentration of People's Forces.

Hurtado served as President of Ecuador from 1981 to 1984 due to Roldós's death in office.

It was Ecuador's largest political party, having won 35% of the seats in the 1998 elections to the Congreso Nacional.

In the 1998 presidential elections, party member Jamil Mahuad was elected president, and after a coup d'état and brief military rule, he was succeeded in 2000 by the vice-president, Gustavo Noboa, who was also in the party.