Eight gibberellins (GAs) were identified and quantified in extracts of seed of the flax, Linum usitatissimum L. cv. Hwanamama, Hwabaekama by GC-MS-SIM and Kovats retention indices. Four of these gibberellins are members of the early-C13-hydroxylation pathway ($GA_{53}$, $GA_{19}$, $GA_{20}$ and $GA_1$) and four are members of the non-C13-hydroxylation pathway ($GA_{12}$, $GA_{24}$, $GA_9$ and $GA_4$). Of these eight gibberellins, GA24 was more abundant in yellow-seeded flax (cv. Hwanamama) than in brown-seeded flax (cv. Hwabaekama), whereas $GA_9$ was 8.3-fold more abundant in brown-seeded flax (cv. Hwabaekama) than in yellow-seeded flax (cv. Hwanamama). In both flax cultivars, non-C13-hydroxylation pathway was the main route leading to endogenous accumulation of $GA_4$ in the seed.