Daniel Siebert (born 4 May 1984) is a German football referee who is based in Berlin. He referees for FC Nordost Berlin of the Berlin Football Association. He is a FIFA referee, and is ranked as a UEFA elite category referee.

Siebert, referee of the club FC Nordost Berlin, has been officiating since 1998. In 2007, he was appointed as a DFB referee. Siebert made his premiere in the 2. Bundesliga in 2009. He was appointed as a Bundesliga referee for the 2012–13 season, and made his first top-flight appearance in the match between Schalke 04 and FC Augsburg on 1 September 2012, issuing three yellow cards.

On 24 October 2014, it was announced Siebert would replace Wolfgang Stark as a FIFA referee in 2015.^[1] This made Siebert the youngest of the ten German FIFA referees.^[2]

Siebert made his international debut on 29 May 2015 when he officiated the 2015 UEFA European Under-19 Championship qualification match between Portugal and Turkey. The first senior international match Siebert officiated was a friendly match between Luxembourg and Moldova on 9 June 2015.

Siebert has officiated 3 matches during the 2020 European Championship. He oversaw the Group D Scotland–Czech Republic fixture, the Group E Sweden–Slovakia match, and the Round of 16 game between Wales and Denmark.

He whistled 4 matches of the 2021 FIFA Arab Cup such as the final match between Tunisia and Algeria.

Siebert was born in Berlin, where he still lives. He works as a teacher part-time at a sports school in Berlin.^[2]