| Country | United States | ||
|---|---|---|---|
| Champions | Brooklyn Italians | ||
| Runners-up | Richardson Rockets | ||
|
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The 1991 United States Open Cup was the 78th edition of the soccer tournament to crown the national champion of the United States.
The Brooklyn Italians (NESSL) won the cup 1-0 against the Richardson Rockets (USISL) of Texas in a match played at Brooklyn College in Brooklyn, New York.