Family
- father George DiCaprio: Former comic-book distributor; divorced from DiCaprio's mother
- mother Irmelin DiCaprio: Born in Germany; divorced from DiCaprio's father
- step-mother Peggy DiCaprio: Was previously married and has son Adam from that marriage
- step-brother Adam Farrar: Born c. 1971; featured in the film "Pups" (1999); arrested in March 2000 for allegedly attempting to murder his girlfriend
- grandmother Helena Idenbirken: Maternal grandmother; Leo called her "Oma"; died Aug. 4, 2008 in her native North Rhine-Westphalia, Germany
Companions
- Gisele Bundchen: Brazilian ; dating as of spring 2000; she reportedly told a Brazilian magazine in February 2001 that she and DiCaprio are engaged; reportedly split c. fall 2002
- Kristen Zang: dated c. 1996-97; reportedly reconciled briefly in 1998; no longer together; reportedly dating again in late 1998; no longer together
- Vanessa Hayden: dated briefly in 1998
- Companion Bar Refaeli: Israeli; began dating in January 2006; briefly split in October 2007; announced they split again in June 2009
