Ben Schnetzer

as Sergiu Celibidache (young adult)

John Malkovich

as Sergiu Celibidache

Sean Bean

as Demostene Celibidache

Miranda Richardson

as Ioana Celibidache

Kate Phillips

as Ioana Celibidache (young adult)

Anton Lesser

as Martin Steinke

Tamzin Merchant

as Ortancia

Charlie Rowe

as Miki