Family
- father Arthur Schwimmer: Appellate lawyer; married Schwimmer's mother in 1964
- mother Arlene Coleman-Schwimmer: Handled the celebrity divorces of Roseanne, Julianne Phillips and Elizabeth Taylor; married Schwimmer's father in 1964
- sister Ellie Schwimmer: Born c. 1965
Companions
- Companion Mili Avital: Met during the filming of "Kissing a Fool" (1998); had an on-again, off-again relationship until they split in 2001; co-starred in the NBC miniseries "Uprising" (2001)
- Companion Carla Alaponte: Began dating in 2002; split in November 2003
- Companion Tina Barrett: Rumored to have briefly dated in 2004; no longer together
- Companion Gina Lee: Rumored to have briefly dated in 2004; no longer together
- Mili Avital: met during the filming of "Kissing a Fool"; have had an on-again; off-again relationship; co-starred in the NBC miniseries "Uprising"; as of late fall 2001, reportedly no longer together
- Natalie Imbruglia: together 1996-97
- Sarah Trimble: together 1993-96
- Companion Rochelle Ovitt: Began dating in August 2004; has had a off again, on again relationship
