Thomas Kelvin Coslett (born 14 January 1942) is a Welsh former dual-code international rugby union and professional rugby league footballer who played in the 1960s and 1970s, and coached rugby league in the 1970s and 1980s. He played representative level rugby union (RU) for Wales, and at club level for Aberavon RFC and Llanelli RFC, as a goal-kicking full-back, and representative level rugby league (RL) for Wales and Other Nationalities, and at club level for St. Helens (captain), and Rochdale Hornets, as a toe-end kicking style (rather than round the corner kicking style) goal-kicking fullback, prop, second-row, or loose forward, i.e. number 1, 8 or 10, 11 or 12, or 13, and coached at club level for Rochdale Hornets, Wigan and St. Helens.