|Aliases:||Dad, Mr. McGuire|
|Family & Friends|
|Family:|| Lizzie McGuire (Daughter)|
|Friends:||Eduardo and Daniela Sanchez|
|Interests:||Protecting his children, Jo McGuire, hanging out with Matt or Lizzie|
|Last appearance:||The Lizzie McGuire Movie|
Sam McGuire is Lizzie's father. He could best be described as a bit goofy and quite clueless about raising his kids. However, he always tries his best to help Lizzie and understand her, and is always available to lend a helping hand.
Sam was born in approximately 1961. He is stated to have been a nerdy child and teenager, president of the Audiovisual Club, a Mathlete, and a hall monitor. He built a soap box racer which he still keeps in a shed outside the house, and his aptitude test revealed him to have "untapped mechanical ability."
He is afraid of heights because of a "bad rope-climbing incident."
Sam did not like cheerleaders in school, thinking they were snooty.
Sam is often clueless about what his children are really up to, leaving it to their mother (Jo McGuire) to deal with issues of children and family. But he sometimes enjoys clever schemes of the children when he finds out about them (much to the distress of Jo, who may find them to be a bad idea). He is portrayed with a good deal of clumsiness — which his daughter Lizzie apparently inherited.
Sam pretends to hate the fact that Lizzie is growing up and tries his best to stop her. However, in the Season 2 episode Bye Bye Hillridge Junior High, he shows he has learned to accept that growing up and getting older is inevitable when he tells Lizzie that she grew up in middle school. He also tells her about all the things he remembered her doing (namely, running for class president, rhythmic gymnastics, helping to save the environment and getting her first job). After she explained to him that she failed at every one of those things, he assures her that she tried her best, and that the only time she failed at something was when she didn't try. He then tells her he thinks she will do just fine in high school.
Sam likes to eat whole jalapenos.