The fourth season of NYPD Blue premiered on ABC on October 15, 1996, and concluded on May 20, 1997.
| NYPD Blue | |
|---|---|
| Season 4 | |
 Season 4 U.S. DVD Cover | |
| No. of episodes | 22 |
| Release | |
| Original network | ABC |
| Original release | October 15, 1996 – May 20, 1997 |
| Season chronology | |
| Actor | Character | Main cast | Recurring cast |
|---|---|---|---|
| Jimmy Smits | Bobby Simone | entire season | — |
| Dennis Franz | Andy Sipowicz | entire season | — |
| James McDaniel | Arthur Fancy | entire season | — |
| Nicholas Turturro | James Martinez | entire season | — |
| Sharon Lawrence | Sylvia Costas | credited in all but only appeared in 1,7,11,&15 | — |
| Gordon Clapp | Greg Medavoy | entire season | — |
| Kim Delaney | Diane Russell | entire season | — |
| Andrea Thompson | Jill Kirkendall | — | eps.6–8,10-14,17-18,20 |