|Notre Dame Fighting Irish – No. 12|
|High school||Oak Ridge (El Dorado Hills, CA)|
|Born:||March 30, 1998|
El Dorado Hills, California
|Height||6 ft 0 in (1.83 m)|
|Weight||203 lb (92 kg)|
Book sat behind Brandon Wimbush throughout the 2017 season, however he started for an injured Wimbush against North Carolina. During the 2018 Citrus Bowl, Book came off the bench and led the Irish to a 21–17 victory over LSU. After a pair of slim home victories over unranked opponents Ball State and Vanderbilt in 2018, Book was chosen as the starter over Brandon Wimbush for a road game against Wake Forest. The result was a 56–27 Notre Dame victory, with Book throwing for 325 yards and two touchdowns, and running for three more. Against #7 Stanford, Book threw for 278 yards and four touchdowns. In week 10, Book threw for two touchdown passes and ran 23 yards for a score in the closing minutes to lead No. 3 Notre Dame to a 31-21 victory over Northwestern.
- "Ian Book Timeline Events". 247sports.com. Retrieved 2018-09-30.
- "No. 8 Notre Dame swaps quarterbacks, beats Wake Forest 56–27". Washington Post. Retrieved 2018-09-30.
- "Ian Book makes all the difference for Notre Dame's renewed College Football Playoff hopes". CBSSports.com. Retrieved 2018-09-30.
- "Notre Dame vs. Northwestern - Box Score - November 3, 2018 - ESPN". ESPN.com. Retrieved 2018-11-05.
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