Horace David Jeanes ((1943-12-27)27 December 1943) is an English former rugby union and World Cup winning professional rugby league footballer who played in the 1960s and 1970s. He played club level rugby union (RU) for Keighley RUFC and Wakefield RFC, and representative level rugby union for Yorkshire and rugby league (RL) for Great Britain and Yorkshire, and at club level for Wakefield Trinity (captain), Leeds and Huddersfield, as a prop.

David Jeanes was born in Skipton, West Riding of Yorkshire, England. He grew up on Greatwood Avenue, and attended the town's Parish Church Primary School. Due to a shortage of places at the nearest grammar school, Ermysted’s, Jeanes instead joined Keighley Boys' Grammar School, where he learned to play rugby union.

After leaving school, Jeanes began playing rugby union for Keighley RUFC. After moving to Wakefield with his family, he joined Wakefield RFC. He attracted the attention of the town's rugby league team, Wakefield Trinity, and was offered a contract to play for the club.

Prior to his professional career, Jeanes played one game of rugby league in 1961 with amateur club Silsden in an under-19's cup final against Keighley Albion.

Jeanes played left-prop, and scored a try in Wakefield Trinity's 17-10 victory over Hull Kingston Rovers in the Championship Final during the 1967–68 season at Headingley, Leeds on Saturday 4 May 1968.

Jeanes played left-prop in Wakefield Trinity's 10-11 defeat by Leeds in the 1967–68 Challenge Cup "Watersplash" Final during the 1967–68 season at Wembley Stadium, London on Saturday 11 May 1968, in front of a crowd of 87,100.

Jeanes played left-prop and was captain in Wakefield Trinity's 11-22 defeat by Halifax in the 1971–72 Player's No.6 Trophy Final during the 1971–72 season at Odsal Stadium, Bradford on Saturday 22 January 1972.

In September 1972, Jeanes was signed by Leeds for a fee of £8,000.