Nichael "Michael" Bluth is a fictional character and the main protagonist of the American television satirical sitcom Arrested Development, created by Mitchell Hurwitz, and portrayed by Jason Bateman. Michael serves as the series' straight man, often leading his family through its many crises.

Michael (born December 14, 1967) is the second oldest Bluth son, and the father of George Michael Bluth. He has an older brother, Gob (pronounced like the biblical character Job), a younger half-brother, Buster, and a twin sister, Lindsay (she is later revealed to be adopted and older than Michael). He also has an adopted Korean brother named Annyong, who is almost 20 years younger.

While his father George Sr. goes to jail, Michael becomes head of the family and CEO and President of the Bluth Company. His authority, however, is constantly undermined by his family. He remained President for all of Season 1, but was replaced by Gob in Season 2. As Vice President, Michael was the Bluth Company's de facto head, doing all the work of the President while being scrutinized by the SEC for his father's crimes. In Season 3, Michael was firmly in charge again, though the sibling rivalry and family interference did not totally recede.

Michael is the most functional and level-headed Bluth, but can occasionally be dishonest and selfish. He is usually the only source of stability for his family, much to his chagrin. Despite this, he has a problem letting go of control, and tends not to listen to his son's feelings when making decisions for him. He is especially critical of George Michael's girlfriend, Ann, often forgetting her name, and frequently referring to her as any number of random, only loosely appropriate monikers, including "Egg", "Bland", "Plant", "Yam", and (with thinly veiled disappointment and raised eyebrows) "Her?" He often threatens to leave the family out of frustration.

Michael's wife Tracy died (presumably of ovarian cancer) two years prior to the first season, and she was in a coma for some months before she passed. In the show, Michael is often reluctant to date, thinking that his son would disapprove, and most of his relationships have featured misunderstandings or outright deception. His wife's death is usually the subject of tasteless and unaware jokes made by his family members.

In season 3, it is revealed that there is a typo on his birth certificate and that his legal name is Nichael Bluth. Also, Michael discovers the truth about his father's crimes and his sister's identity. In the last episode, Michael and his son George Michael try once more to abandon the Bluth family by sailing away on a yacht, but after they arrive at the new home, they find that George Sr. was also on the yacht.

In season 4, Michael's fortunes decline swiftly and he becomes more petulant, narcissistic, and guile as he avoids a massive debt to Lucille Austero, manipulates his family into signing away their movie portrayal rights, and allows his relationship with George Michael to deteriorate by encroaching on his privacy, petulantly avoiding him, and carrying on a relationship with the same woman as his son. During this season, Michael attended University of Phoenix online; it is not specified whether he earned a degree from this institution nor if he earned a degree when he was younger from elsewhere.

Michael is the only character who has appeared in every episode of the series.