Etienne Nestor Ys (born 26 February 1962) is a Curaçaoan politician who served as the 23rd and 26th Prime Minister of the Netherlands Antilles from 2002–2003 and again from 2004–2006.
Ys studied law at the Groningen University and graduated in 1985.
Following his graduation he worked as a tax inspector at the Dutch Revenue Services "belastingdienst".
He went on to serve as Minister of Finance of the Netherlands Antilles from 1994–1995, and then commissioner of the island territory of Curaçao.
After the formation of the new government, he was appointed as chairman of the board of the Central Bank of Curaçao and Sint Maarten.