Before qualifying for admission to advanced degree programs, the bachelor's degree recipients in the United States complete 4 years (even 5!) of full-time study.
Therefore, international applicants holding a 3-year bachelor's degree bear a heavy cross while applying to grad schools in the US.
In order to help such applicants, we emailed the admissions office of several universities to check if they accept 3-year degree holders and here's what I found:
The following universities accept 3-year bachelor's degree holders for admissions to their graduate programs -
Massachusetts Institute of Technology

See Admission Statistics ❯
University of California San Diego

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The University of California at Berkley

See Admission Statistics ❯
John Hopkins University

See Admission Statistics ❯
The University of Maryland at College Park

See Admission Statistics ❯
New York University

See Admission Statistics ❯
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The University of Texas at Dallas

See Admission Statistics ❯
The University of Texas at Arlington

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Georgia State University

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The University of North Carolina at Charlotte

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California State University at San Bernardino

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University of Nevada at Las Vegas

See Admission Statistics ❯
California Institute of Technology

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Princeton University

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New York Institute of Technology

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Boston University

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Columbia University

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Purdue University

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Northeastern University

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The University of North Texas

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Conclusion
There are many more universities in the United States that accept 3-year degree holders for various programs. If the admissions committee can verify that the applicant has reached an academic level equivalent to a U.S. bachelor's degree, the length of their degree doesn't matter!
We can also study your profile and shortlist such universities for you in other countries.