| Season Number: | 8 |
| Bgcolour: |
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| Num Episodes: | 22 |
| Network: | NBC |
| Prev Season: | Season 7 |
| Next Season: | Season 9 |
| Episode List: | List of ER episodes |
The eighth season of the American fictional drama television series ER first aired on September 27, 2001, and concluded on May 16, 2002. The eighth season consists of 22 episodes.
After being gone for five years, Susan Lewis returns to the show providing continuity of the earlier years and some closure with Greene. Greene begins to experience health problems and deals with Rachel after she starts causing problems. In addition, Weaver also has a revelation and confronts and accepts her sexuality. The season's long story line of Greene's illness and death and how it affects many characters marks Season 8 as a major turning point in the series. This season also saw a major change in the cast, with four characters leaving, including original characters Greene and Benton as well as Cleo and Dave. Abby tries to help a neighbor with an abusive boyfriend but faces repercussions, and Kovac retaliates against the man who assaulted her. In turn, two new main characters with very different personalities – Michael Gallant and Greg Pratt – are introduced in Season 8. For the first time, John Carter is centered as the main character of the show at the end of the season. In this season, several staff members face personal and professional pressures, including Greene and Corday who face the most difficult issue of all when their baby overdoses on Ecstasy pills. The two argue over Rachel's presence in their home after their baby nearly dies. Weaver becomes more aggressive and she accepts that she is a lesbian. Greene's final episode as a regular character is the 21st episode of Season 8. Benton and Finch also leave to make new changes in their lives. After Greene's death, many of the characters become affected, especially Carter who reads two letters to the staff. A plague hits the ER as Season 8 ends. Several members attend Mark's funeral.
This season saw the final appearance on ER of series regulars Michael Michele and Erik Palladino, and the final appearances as a series regular for Anthony Edwards and Eriq La Salle.
Original executive producers John Wells and Michael Crichton reprised their roles. Seventh season executive producer Jack Orman returned as executive producer and show runner. Previous executive producer Christopher Chulack remained a consulting producer while working on Wells' Third Watch. Seventh season co-executive producer Meredith Stiehm also served as a consulting producer for the eighth season but left the crew with the close of the season. Seventh season supervising producers R. Scott Gemmill and Dee Johnson were promoted to co-executive producers for the eighth season. Seventh season producers Richard Thorpe, Joe Sachs, Jonathan Kaplan, and Wendy Spence Rosato all returned for the eighth season. Sachs was promoted to supervising producer mid-season. Michael Salamunovich returned as co-producer but left the crew with the close of the season.
Wells wrote a further two episodes for the season. Orman was the seasons prolific writer with six episodes. Gemmill wrote five episodes. Sachs wrote three episodes. Johnson wrote four episodes. Stiehm wrote three episodes. David Zabel joined the crew as executive story editor and contributed to four episodes as a writer. Writer Elizabeth Hunter became a story editor for the second half of the season only and wrote two further episodes.
Producers Kaplan and Thorpe served as the season's regular directors. Kaplan helmed five episodes while Thorpe directed four. New directors Nelson McCormick and actor Vondie Curtis-Hall each directed two episodes. Cast member and regular director Laura Innes helmed a further episode. Series veterans Félix Enríquez Alcalá, Christopher Misiano, David Nutter, and Tom Moore all returned to direct further episodes. Show runner Orman made his television directing debut with an episode. The season's other new directors were Alan J. Levi, Jessica Yu, and Jesús S. Treviño.
See also: List of ER episodes.