Marchese Onofrio del Grillo is a fictional character from the 1981 Italian film "Il Marchese del Grillo," directed by Mario Monicelli. The character is portrayed by Alberto Sordi and is known for his witty and satirical nature. Set in 19th-century Rome, the film explores themes of class and social dynamics through the life of the aristocratic marchese. The story follows Onofrio as he navigates the complexities of his privileged life while interacting with common people. His humorous escapades and clever remarks highlight the contrasts between the nobility and the lower classes, making the film a classic in Italian cinema.