Purpose: This study aimed to analyze the anti-inflammatory effects of <i>Dictyopteris undulata</i> extract on skin using RAW 264.7 cells.Methods: Its anti-inflammatory effects on RAW 264.7 cells were evaluated by measuring the cell viability, gene expression levels (<i>IL-1α/IL-1β/IL-6</i> and <i>TNF-α</i>), and nitric oxide (NO)/prostaglandin E2 (PGE<sub>2</sub>) production.Results: Quantitative real-time polymerase chain reaction showed that the <i>D. undulata</i> extract decreased the mRNA levels of <i>IL-1α/IL-1β/IL-6</i> and <i>TNF-α</i>. Additionally, PGE<sub>2</sub>/NO detection revealed that <i>D. undulata</i> extract exhibited anti-inflammatory properties.Conclusion: <i>D. undulata</i> extract is a potential anti-inflammatory compound. Further study on the anti-inflammatory mechanisms of <i>D. undulata</i> extract would facilitate the development of cosmeceutics and pharmacological treatments.