Oltman Jan ("Arnold") van Calker (born 16 September 1976, Gasselternijveenschemond) is a Dutch bobsledder, who has competed since 1999. His best World Cup finish was second in the four-man event Königssee, Germany in January 2009.

Van Calker also finished 17th in the four-man event at the 2002 Winter Olympics in Salt Lake City. He also finished 23rd in the two-man event at the FIBT World Championships 2005 in Calgary.

References

• http://www.fibt.com/index.php?id=47&tx_bzdstaffdirectory_pi1%5BshowUid%5D=100338&tx_bzdstaffdirectory_pi1%5BbackPid%5D=93%5B%5D (FIBT profile)
• Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill; et al. "Arnold van Calker". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 2020-04-18.