Hans-Heinrich Hardt was born in 1955. From 1983 until 1989, he studied acting under Uta Sax and Janina Szarek in Berlin. Between 1992 and 2000, he was a company player at the Kleist-Theater in Frankfurt /Oder, followed by stints at the Theater Potsdam (2001), Burghofspiele Eltville (2003, 2010, 2011) and the Vagantenbühne Berlin (2011).

From 2000 on, Hardt also regularly appeared in film and TV productions He guest-starred on shows like "Der Kriminalist", "Polizeiruf 110", and "Tatort", and had parts in made-for-TV films like "Alle Zeit der Welt" (2011) and "Unverschämtes Glück" (2015).

On the big screen, he appeared in Dietrich Brüggemann's "Neun Szenen" ("Nine Takes", 2006) and "Drei Zimmer/Küche/Bad" ("Move", 2012). After a bit part in Markus Goller's comedy "Alles ist Liebe" (2014), Hardt joined the casts of two "German Mumblecore" films, the tragic comedy "Alki Alki" ("Alky, Alky", 2015) and the romance "Beat Beat Heart" (2016). This was followed by a leading role in Philipp Eichholtz' mumblecore tragicomedy "Luca tanzt leise" (2016), which premiered at the Max-Ophüls-Preis Film Festival and was released in early 2017.

In addition to his acting career, Hans-Heinrich Hardt has been a team member of the coaching agency "Inszenio" since 2007.