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Arnold Coster (born Arnold Schiedam, 1976, Netherlands) is a Dutch mountaineer.
Educated as a mechanical engineer, he became intensely involved with climbing at a young age when he started climbing in the Alps. He moved to Nepal in 2003 to follow his passion of mountaineering.

Coster has summited 5 of the 14 peaks above 8000m. In 2010 he became the first person from the Netherlands to summit Makalu (8481 m).

He is married to Maya Sherpa, a leading female climber in Nepal. Together they have a daughter named Roos Dawa Coster and live in Kathmandu, Nepal.

His company, Arnold Coster Expeditions, was criticised for not contacting the families after two of seven clients died on Everest in 2016. He posted a communication on the social media website Facebook about the incident.

List of expeditions led by Arnold Coster

