"What's That" is the second and final single by British band The Madness from their 1988 eponymous album. It was released in the UK only on 7" and 12" vinyl, and also as a 10" vinyl picture disc. It was the first release by Madness or any of its spin-off bands not to reach the top 75 in the UK. It peaked at No. 92 and lasted two weeks on the chart, dropping to No. 98 the following week after its debut.