Johann Evangelist Haydn (December 23, 1743 – May 10, 1805) was a tenor singer of the classical era; the younger brother of the composers Joseph Haydn and Michael Haydn. He was often called "Hansl", a diminutive form of "Johann". It is possible that Johann was paid as a singer as a favor to Joseph; that Haydn's employer at the time (Prince Nikolaus Esterházy) esteemed Haydn's services enough to make such arrangements is suggested by a similar act later on, in which he kept on the payroll another mediocre singer, Haydn's mistress Luigia Polzelli.