This study examined the test-retest reliability of V̇O₂max in adolescent V̇O₂ plateau achievers and nonachievers. Nineteen male long-distance runners completed a modified Taylor running protocol to volitional fatigue twice within a one-week period. Results showed that 10 subjects did not achieve a plateau in either test (No P), and 9 achieved a plateau in at least one of the tests (P). The V̇O₂max differed (p < .05) between tests (Test 1 and Test 2) for the entire sample (Test 1 = 70.4 ± 6.0, Test 2 = 71.7 ± 6.3) but not within the groups (No P, Test 1 = 72.1 ± 4.4, Test 2 = 73.2 ± 4.2; P, Test 1 = 68.5 ± 7.3, Test 2 = 70.1 ± 7.9). V̇O₂max was similar for plateau achievers and nonachievers in both Test 1 and Test 2 (p > .05). Interclass correlation coefficients for V̇O₂max were high for both the No P (R = .87) and P (R = .97) groups. A high test-retest reliability coefficient for V̇O₂max can be obtained even when a plateau in V̇O₂ is not achieved.