Historically, Schizonepeta tenuifolia (ST) has been used for the treatment of skin disorders, such as allergic dermatitis, eczema, and inflammatory diseases. In this study, we examined whether ST inhibited 2,4-dinitrochlorobenzene (DNCB)-induced atopic dermatitis (AD) in BALB/c mice. In histopathological analyses of the epidermis and dermis, skin thickness was significantly increased in DNCB-induced mice as compared with normal group. Treatment with ST inhibited this inflammatory change and markedly suppressed the secretion of immunoglobulin E, tumor necrosis factor α, and interleukin 6 levels in the serum of DNCB-induced mice. In addition, ST treatment significantly restored the upregulation of proinflammatory factors, such as nuclear factor (NF)-κB and mitogen-activated protein kinase expression. Taken together, due to its ability to suppress inflammatory factors and upregulate proinflammatory factors, ST may be useful as a therapeutic treatment for AD. ST extract application decreased both epidermis and dermis thickness in DNCB-induced mice. In serum, ST reduced immunoglobulin E, tumor necrosis factor, and interleukin 6 level. In addition, ST suppressed NF-κB activation as well as the mitogen-activated protein kinase activities.