Frau Grubach is K.’s landlady at the boardinghouse, a gentle and conservative woman who favors K. She is keen on maintaining a respectable establishment and occasionally pries into her boarders' personal lives.

Fräulein Bürstner is a young typist living next to K. in the boardinghouse, whose room becomes the site of K.'s initial questioning. Her interactions with K. are brief but significant, affecting his early experience with the court.

Titorelli is a painter who works for the lower court and provides K. with insights into its inner workings. He is talkative and slightly pompous, playing a role in explaining various aspects of the judiciary process.

Uncle Karl is K.’s domineering uncle from the country who visits to support K. upon hearing about his trial. He introduces K. to Herr Huld, emphasizing the importance of addressing the legal situation.

Leni is a young nurse working for Herr Huld who becomes romantically involved with K. Her motivations and character are enigmatic, and she appears to have a mysterious connection to the court.

Herr Huld is an elderly lawyer engaged by K. upon his uncle’s recommendation, known for his loquacity and purported court connections. He offers K. assistance that ultimately proves to be vague and unhelpful.