Deena Michelle Kastor (née Drossin; born February 14, 1973) is an American long-distance runner.

She finished with an unofficial time of 2:29:35, after overtaking competitor Magdalena Lewy Boulet in mile 23.

Kastor ran most of the race from behind, while Lewy Boulet built a commanding lead very early on, running alone for most of the marathon.

With some 10 miles (16 km) to go, Kastor made a move to catch up to Lewy Boulet, stringing out the field.

After running the majority of the race in first, on her way to breaking the course record, she dropped to second place to finish behind Great Britain's Mara Yamauchi.

[11][12] It was announced in August 2010 that Kastor and her husband were expecting their first child, Piper Bloom, in March 2011.

[14][15] In January 2013, Kastor announced she would be running in the 2013 Los Angeles Marathon, to be held on March 17, 2013[16] where she finished third in 2:32:39.

In April 2014, the 41-year-old Kastor won the 2014 More|Fitness Half-Marathon in New York's Central Park in a U.S. masters record of 1:11:38.

[21] Kastor was selected as the top women's marathoner in the world in 2006 by Track and Field News magazine.