Family
- father Emil Zellweger: Swiss-born; married Zellweger's mother in 1963; worked in the oil refining business
- mother Kjellfrid Zellweger: Norwegian-born; married Zellweger's father in 1963; moved to the United States in order to work as a governess for a Norwegian family in Texas
- brother Drew Zellweger: Born in 1967; works in the wine industry
Companions
- Companion Jim Carrey: Met during filming of "Me, Myself and Irene" (2000); began dating only after filming was completed; went public with relationship in December 1999; split in fall 2000 after approximately 18 months together
- Companion George Clooney: Rumored to have briefly dated in 2001; no longer together
- Companion Josh Pate: Began dating in November 1996, after meeting on the film "Deceiver" (1997); no longer together
- Companion Bradley Cooper: Reportedly dating as of Summer 2009
- Companion Dan Abrams: Dated in early 2009; no longer together
- husband Kenny Chesney: Met in January 2005, at a tsunami relief benefit; married May 9, 2005 on the resort island of St. John in the U.S. Virgin Islands; after only four months of marriage, they announced their plans for an annulment; annulment was finalized in December 2005
- Companion Jack White: Together from June 2003 to September 2004
- George Clooney: reportedly dated in fall 2001
- Jim Carrey: met during filming of "Me, Myself and Irene" (2000); began dating only after filming was completed; went public with relationship in December 1999; relationship reportedly ended in late fall 2000 after approximately 18 months
- Josh Pate: began dating in November 1996 after the filming of "Deceiver"; no longer together
- Sims Ellison: born on March 10, 1967; committed suicide on June 6, 1995; met at the University of Texas
