Julia Mächtig (born 1 January 1986 in Rostock) is a German heptathlete.

She won the German senior long jump title in 2006.

In the 2007 season she won her first national heptathlon title and placed third at the 2007 European Athletics U23 Championships.

She also made her senior international debut at the 2007 European Athletics Indoor Championships, where she came ninth in the women's pentathlon.

[1] In 2012 she won the Mehrkampf-Meeting Ratingen with a personal best score of 6341 points, which included a long jump best of 6.49 metres.