Gwilym Meirion Jenkins (12 August 1932 – 10 July 1982) was a British statistician and systems engineer, born in Gowerton (Welsh: Tregŵyr), Swansea, Wales. He is most notable for his pioneering work with George Box on autoregressive moving average models, also called Box–Jenkins models, in time-series analysis. While at Lancaster, he founded and became managing director of ISCOL (International Systems Corporation of Lancaster). He remained in academia until 1974, when he left to start his own consulting company. He was a jazz and blues enthusiast and an accomplished pianist.