Ganz appeared in the following films: •
The Man in the Black Derby (1960), as Bellboy • '''' (1961) •
Es Dach überem Chopf (1962), as Fred Weber •
The Smooth Career (1967), as Barnhard Kral •
Eine große Familie (1970, TV Movie), as Heinz Hallasch • ''
(Sommergäste'', 1976), as Jakov Shalimov •
Lumière (1976), as Heinrich Grün •
The Marquise of O... (1976), as Der Graf •
Die Wildente (
The Wild Duck, 1976), as Gregers •
The American Friend (
Der Amerikanische Freund, 1977), as Jonathan Zimmermann •
Die linkshändige Frau (
The Left-Handed Woman, 1978), as Bruno •
The Boys from Brazil (1978), as Professor Bruckner •
Schwarz und weiß wie Tage und Nächte (1978, TV Movie), as Thomas Rosemund •
Messer im Kopf (
Knife in the Head, 1978), as Dr. Berthold Hoffmann •
Nosferatu: Phantom der Nacht (
Nosferatu the Vampyre, 1979), as
Jonathan Harker •
Retour à la bien-aimée (
Return to the Beloved, 1979), as Dr. Stephan Kern •
Oggetti smarriti (
Lost and Found / Lost Objects / An Italian Woman, 1980), as Werner •
5% de risque (1980), as David •
Polenta (1980), as Jules, the Narrator •
Der Erfinder (
The Inventor, 1980), as Jakob Nüssli •
La provinciale (1980), as Remy •
Etwas wird sichtbar (1981) •
La Dame aux camélias (
The Lady of the Camellias, 1981), as Count Perregaux •
Ręce do góry (
Hands Up!, 1981) •
Die Fälschung (
Circle of Deceit, 1981), as Georg Laschen •
Logik des Gefühls (
The Logic of Emotion, 1982) •
Krieg und Frieden (
War and Peace, 1982) •
Dans la ville blanche (
In the White City, 1983), as Paul • ''
(System ohne Schatten'', 1983), as Faber •
Killer aus Florida (
Killer from Florida, 1983, Short) •
De ijssalon (
Private Resistance, 1985), as Gustav •
El río de oro (1986), as Peter •
Der Pendler (1986) •
Väter und Söhne – Eine deutsche Tragödie (1986, TV Mini-Series), as Heinrich Beck •
Der Himmel über Berlin (
Wings of Desire, 1987), as Damiel •
Un amore di donna (1988), as Franco Bassani •
Von Zeit zu Zeit (1989), as Jumbo •
Bankomatt (1989), as Bruno •
Strapless (1989), as Raymond Forbes •
The Legendary Life of Ernest Hemingway (1989), as
Ezra Pound •
Tassilo (1991, TV Series), as Tassilo •
Erfolg (
Success, 1991), as Jacques Tüverlin •
Children of Nature (1991), as Engill •
La Domenica specialmente (
Especially on Sunday, 1991), as Vittorio (segment "La domenica specialmente") •
Prague (1992), as Josef • ''
(Night on Fire'', 1992), as Peter Keller • ''
L'Absence (The Absence'', 1992), as Player •
The Last Days of Chez Nous (1992), as J.P. •
In weiter Ferne, so nah! (
Faraway, So Close!, 1993), as Damiel •
Heller Tag (1994), as Georg •
Diario senza date (1995) •
Tödliches Schweigen (
Deadly Silence, 1996, TV Movie), as Hans Plache •
Saint-Ex (1997), as
Antoine de Saint-Exupéry • ''
(Daybreak'', 1998, TV Movie), as Fehleisen •
Mia aioniotita kai mia mera (
Eternity and a Day, 1998), as Alexandros • ''You Can't Go Home Again'' (1999), as Narrator (voice) •
WerAngstWolf (2000) •
Pane e Tulipani (
Bread and Tulips, 2000), as Fernando Girasole •
Johann Wolfgang von Goethe: Faust (2001, TV Movie), as
Faust •
La forza del passato (
The Power of the Past, 2002), as Bogliasco • ''
(Epstein's Night'', 2002), as Adam Rose •
Behind Me (2002), as Himself •
Luther (2003), as
Johann von Staupitz •
The Manchurian Candidate (2004), as Delp •
Der Untergang (
Downfall, 2004), as
Adolf Hitler •
Have No Fear: The Life of Pope John Paul II (2005, TV Movie), as
Cardinal Stefan Wyszynski •
Vitus (2006), as Grandfather •
Baruto no Gakuen (
バルトの楽園;
Ode an die Freude, 2006), as Kurt Heinrich •
Youth Without Youth (2007), as Prof. Roman Stanciulescu •
Stairway to Nowhere (2008), as Brot Darsteller •
Der Baader Meinhof Komplex (
The Baader Meinhof Complex, 2008), as
Horst Herold •
Η Σκόνη του Χρόνου (
The Dust of Time, 2008), as Jacob •
The Reader (2008), as Professor Rohl •
Giulias Verschwinden (2009), as John • '''' (2010), as Kater •
Taxiphone: El Mektoub (2010) • ''
(Colors in the Dark'', 2010), as Fred •
Das Ende ist mein Anfang (
The End Is My Beginning, 2010), as Tiziano Terzani •
Unknown (2011), as Ernst Jürgen •
Sport de filles (2011), as Franz Mann •
Night Train to Lisbon (2013), as Older Jorge O'Kelly •
Age of Uprising: The Legend of Michael Kohlhaas (2013), as The Governor •
The Counselor (2013), as the Diamond Dealer •
In Order of Disappearance (2014), as Papa •
Amnesia (2015), as Bruno, Jo's grandfather •
Remember (2015), as Rudy Kurlander #1 •
Heidi (2015), as Alpöhi, Heidi's grandfather • ''Un Juif pour l'exemple'' (2016), as Arthur Bloch •
The Party (2017), as Gottfried •
In Times of Fading Light (2017), as Wilhelm Powileit •
Fortuna (2018), as Brother Jean •
The House That Jack Built (2018), as Verge • '''' (2018), as
Sigmund Freud •
The Witness (2018), as Nikola Radin •
A Hidden Life (2019), as Judge Lueben •
Winter Journey (2019), as Gunther Goldschmidt (final film role) == Notes ==