Marek Zalewski (born 2 February 1963) is a Polish prelate of the Catholic Church who works in the diplomatic service of the Holy See.

He worked in the Central African Republic (1995-1998), at the United Nations in New York (1998-2001), in Great Britain (2001-2004), Germany (2004-2008), Thailand (2008-2011), Singapore (2011-2012), and Malaysia (2012-2014).

[1][2] On 25 March 2014, Pope Francis named Zalewski titular archbishop of Africa[a] and Apostolic Nuncio to Zimbabwe.

[2] He received his episcopal consecration from Cardinal Pietro Parolin, the Secretary of State, on 31 May.

On 21 May 2018, Pope Francis named him Apostolic Nuncio to Singapore and Non-Residential Papal Representative to Vietnam.