Mary's Boy Child – Oh My Lord

"Mary's Boy Child / Oh My Lord" is a 1978 Christmas single by Boney M., a cover of Harry Belafonte's 1956 hit "Mary's Boy Child", put in a medley with the new song "Oh My Lord".

The single had its premiere on 2 November 1978 on the German TV-show Starparade (Episode 44) which aired on ZDF. It topped the UK Singles Chart for four weeks and became Christmas number one in the UK, spending eight weeks in the charts. It has sold 1.89 million units as of November 2015. It was the second single for the group in the UK's all-time best selling singles list. The song was later included as a 5:10 edit leaving out the third verse and with a shortened "Oh My Lord" in the group's Christmas Album, issued in 1981.

In the United States, the track reached number 85 on the Billboard Hot 100, Boney M's last of four singles to chart there. In 2017, it experienced a resurgence and peaked at number 89 on the Holiday 100. In certain areas of the U.S., the medley can sometimes be heard during the Thanksgiving/Christmas holiday season on radio stations which change to temporary all-Christmas music formats.