Josef Bau is a young artist from Kraków who, while working at the Plaszow camp, falls in love with, courts, and marries Rebecca Tannenbaum in a Jewish ceremony.
Bosko is a German police Wachmeister, or sergeant, sympathetic to the Jews and who, early in the novel, has control of the ghetto perimeter. He is so rebellious against the regime that he lets raw material into the ghetto to be made into goods and then lets the goods out to be sold — without asking for a bribe. He is a "man of ideas" in contrast to Schindler, who is a "man of transactions." Bosko eventually absconds from his police station and vanishes into the partisan forests, but he is found and shot for treason.
The chief of the Jewish camp police, Chilowicz works in the Plaszow camp for Goeth and the SS. He is the "hander-out of the caps and armbands of authority in the debased kingdom" and "equates his power with that of the tsars." He is also used by Goeth as an agent of the black market, and since he knows so much about Goeth's dealings, Goeth eventually must get rid of him. The commandant does this by promising him and his family an escape from the camp and then has him found with a gun and executes him.
Rolf Czurda is an Obersturnbannführer, or lieutenant colonel, and chief of the Kraków branch of the SD security service. Schindler meets him at a number of cocktail parties. Czurda releases Schindler after the latter is arrested and imprisoned for kissing a Jewish girl at his factory. Czurda warns Schindler that his behavior is no longer acceptable, saying, "That's not just old-fashioned Jew-hate talking. I assure you. It's policy." Goeth's Plaszow camp is under the authority of Czurda and his superior, Julian Scherner.
Danka is the daughter of the Dresners and cousin of "Red Genia." During an Aktion in the ghetto, she is hidden in the wall by an irrational woman who insists that she cannot fit Mrs. Dresner in also.
Mrs. Dresner is the mother of Danka Dresner. She and her daughter are on the list to go to Schindler's Brinnlitz camp, but they are sent to Auschwitz. Mrs. Dresner almost dies but is nursed back to health by Emilie Schindler.
"Red Genia," as she is called, is the young girl in red whom Schindler, from his horse, sees amid the confusion during the liquidation of the Kraków ghetto in March of 1943. Schindler does not know who she is, but it is learned that she is staying with the Dresners after the Polish couple living in the countryside find it too risky to look after her; her parents had been rounded up by the SS and taken away. "Redcap," as she is called by the Dresner boys, is a first cousin of Mrs. Dresner. She is schooled by her Polish caretakers to pretend not to be Jewish but Polish. Schindler wonders why the SS men do not execute her immediately but steer her back in line when she breaks free. He later realizes that this means that they recognize that she — like all witnesses — is to be executed.