"What Is This Heart?" is the third studio album by How to Dress Well released on June 23, 2014, on Weird World, an imprint of Domino. It is his highest-charting album peaking at number 145 on The Billboard 200.

How to Dress Well is the stage name of Tom Krell, an American multimedia artist, singer-songwriter, and producer from Boulder, Colorado. He began releasing music independently through his own blog around 2009 and via labels like Tri Angle, Lefse Records, Weird World, and eventually Domino later on in his career.