Robert "Rob" John Tobin (born 20 December 1983 in Lincoln, England) is an English sprinter.

At the 2006 European Athletics Championships in Gothenburg, he won the silver medal in the 4x400 m relay along with Rhys Williams, Graham Hedman and Timothy Benjamin, in a time of 3 minutes and 1.63 seconds.

In 2009 in the World Athletic Championships in Berlin, he was part of the silver medal-winning 4x400 relay team.

2010 saw him picking up two medals a silver in the European Athletics Championships and a bronze at the Commonwealth Games.

With Beijing bringing back his best performance in an Olympic Games of 3rd in the 4x400, in a time of 2 minutes 58.81 seconds with Andrew Steele, Michael Bingham and Martyn Rooney.