Christopher W. S. Ross (born October 4, 1943) is an Ecuadorian-born American former diplomat who served as United States Ambassador to Algeria and Syria.

On January 7, 2009, he was appointed as the UN envoy to Western Sahara.

a special adviser for the Middle East and North Africa at the U.S. mission to the United Nations.

His father was Ambassador Claude Gordon "Tony" Ross.

In 2003 he was the US State Department Senior Adviser for Arab World Public Diplomacy.