No, Derek Hough is not married yet but he does have a girlfriend, Hayley Erbert, with whom he has been together for years. 

They started dating in the year 2015 and they are together ever since. Also, they are both dancers and they are appearing together in different reality dancing shows. 

They are active people on different social media platforms and they share about each other a lot on their social media handles. 

They have been together for 6 years now but they have not gotten married yet. They are a sweet family of 4 which includes 2 of their dogs.