1921 International Lawn Tennis Challenge

The 1921 International Lawn Tennis Challenge was the 16th edition of what is now known as the Davis Cup. In the playoff finals, newcomers Japan surprised Australia, 4-1, but would fall to defending champions the United States in the challenge round. The final was played at the West Side Tennis Club in New York City, United States on 2–5 September.

The tournament saw a boom in entries, with a record 12 teams entering to challenge for the cup. Argentina, Czechoslovakia, Denmark, India, Japan, the Philippines, and Spain all entered the tournament for the first time, although Argentina and the Philippines withdrew after the draw.

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