Daniel Warnmark is a Swedish international referee.

He mainly serves as an assistant referee in Swedish domestic league including Allsvenskan. He has experience refereeing Champions League and Europa League, also as an assistant referee.

He has been listed as a FIFA referee since 2010. He was an assistant referee in Euro qualifiers and World Cup 2014. On 1 March 2016, he was named as an assistant referee for UEFA Euro 2016.