The 1999 South American Youth Championship (Sudamericana sub-20) is a football competition contested by all ten U-20 national football teams of CONMEBOL.

Argentina finished undefeated, winning their 3rd trophy.

The three top competitors advance to a single final group of six, wherein each team plays five matches.

The top four teams in the final group qualify to the 1999 FIFA World Youth Championship.

The four best performing teams qualified for the 1999 FIFA World Youth Championship.