He will lead the side for the first time this Friday (17th May) when Scotland play Pakistan in the first of two One-Day Internationals.
Preston Mommsen has been appointed as Coetzer's vice-captain and will lead the side when Coetzer's county commitments take priority.
Coetzer, 29, was born in Aberdeen and has represented Scotland at all youth levels including captaining the side at the 2004 Under-19 World Cup.
In 12 ODIs, he has an average of 49.4 with a highest score of 133, registered against Afghanistan in a World Cricket League match in March 2013.
He played for Durham from 2005, moving to Northamptonshire in 2011, where he has contracted to until the end of 2014.
"This is a massive year for Scottish cricket, and personally a huge honour to captain my country," Coetzer said.
"I will be trying my very best to help Cricket Scotland continue to move forward in world cricket."
© Cricket World 2013
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