Seborrheic dermatitis is generally treated with topical steroids, antifungals, or both. This pilot study was undertaken to examine the possibility of tacrolimus as a useful therapy for seborrheic dermatitis. In a single-center, open-label study, 18 consecutive patients with seborrheic dermatitis were treated with 0.1% tacrolimus for a total of 28 days or until complete clearance occurred, if sooner. Of the patients, 11 (61%) showed 100% clearance of their seborrheic dermatitis; the remaining 7 patients showed 70% to 99% clearance. The most common side effects were mild local burning and irritation.