Ron-Robert Zieler is a German footballer who plays as a goalkeeper for Hannover 96 and the German national team.

In 2008, Zieler kept goal for the German under-19 side that won the 2008 UEFA European Under-19 Football Championship and played with the U-20 at 2009 FIFA U-20 World Cup.

He was called up to the senior squad in August 2011, at first without making an appearance.

Zieler made his debut against Ukraine in a friendly. On 11 November 2011, 22-year-old Zieler played in the senior side 3–3 draw against Ukraine and was the 50th debutant of the Löw-era. He conceded all three goals within 17 minutes in the first half, without having saved a single shot until half time break, but observers found that all three goals were unsaveable, and in the second half he showed a couple of brilliant saves to keep the score down. He is the first keeper since 1954 to concede as many as 3 goals (or more) in a debut match for Germany.

On 28 May 2012, Zieler was named the third goalkeeper of the German squad for the 2012 European Championship. On 15 August 2012, he started in net in a friendly match versus Argentina and was sent off, becoming the first German goalkeeper to earn a red card since the founding of the German national team.