The GRE subject test in biology was a standardized test in the United States created by the Educational Testing Service, and was designed to assess a candidate's potential for graduate or post-graduate study in the field of biology.

Scores on this exam were required for entrance to some biology Ph.D. programs in the United States.

Scores were scaled and then reported as a number between 200 and 990; however, in recent versions of the test, the maximum and minimum reported scores were 940 (corresponding to the 99 percentile) and 400 (1 percentile) respectively.

[8] Tests generally took place three times per year, on one Saturday in each of September, October, and April.

Since many students who apply to graduate programs in biology do so during the first half of their fourth year, the scope of most questions is largely that of the first three years of a standard American undergraduate biology curriculum.