Max van Gelder (12 February 1916 – 2 October 2004), professionally known as Max Geldray, was a Dutch jazz harmonica player. Best known for providing musical interludes for the BBC radio comedy programme The Goon Show, he was also credited as being the first harmonica player to embrace the jazz style.
Geldray was born in the Netherlands and played jazz in the United Kingdom, Belgium, France and his home country, before settling in Britain at the outbreak of the Second World War; he was wounded during the Invasion of Normandy. He appeared in nearly every episode of The Goon Show from 1951 until the end of the show's run in 1960, providing one of the musical interludes and the closing music for each programme, as well as sometimes taking brief speaking roles. After The Goon Show series ended, Geldray settled in the US, where he worked as an entertainer in the Reno casinos alongside performers such as Sarah Vaughan and Billy Daniels. Moving to Palm Springs, he eventually became a part-time counsellor at the Betty Ford Center. He was married twice and had one son. Geldray died in October 2004, aged 88.