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Natural astaxanthin is in high demand due to its multiple health benefits. The microalga <i>Haematococcus lacustris</i> has been used for the commercial production of astaxanthin. In this study, we investigated the effects of six different media with and without a nitrogen source and supplementation with nine organic compounds on the growth and astaxanthin accumulation of <i>H. lacustris</i>. The highest astaxanthin contents were observed in cultures of <i>H. lacustris</i> in Jaworski’s medium (JM), with a level of 9.099 mg/L in JM with a nitrogen source supplemented with leucine (0.65 g/L) and of 20.484 mg/L in JM without a nitrogen source supplemented with sodium glutamate (0.325 g/L). Six of the nine organic compounds examined (leucine, lysine, alanine, sodium glutamate, glutamine, and cellulose) enhanced the production of astaxanthin in <i>H. lacustris</i>, while malic acid, benzoic acid, and maltose showed no beneficial effects.