Bertrand Turnbull (19 April 1887–17 November 1943) was a Welsh field hockey player from Cardiff, who competed in the 1908 Summer Olympics. He also played first-class cricket for Gloucestershire in one match.
In 1908, he won a bronze medal as part of the Welsh hockey team that contested the medals with teams from England, Ireland and Scotland. He played as goalkeeper.
His only taste of first-class cricket came in 1911 when he appeared as wicketkeeper in a match for Gloucestershire against Cambridge University at Fenner's Cricket Ground, Cambridge. In a low-scoring match, he top-scored with an unbeaten 28 in Gloucestershire's first innings, but was out for seven in the second innings; he made one stumping. He also played Minor Counties cricket for Glamorgan.
He died in Canton, Cardiff on 17 November 1943.