The third season of Hey Arnold! consists of 34 quarter-hour episodes and 3 half-hour specials.
Episodes[]
| # | Segment A | Segment B | U.S. air date | Production code |
|---|---|---|---|---|
| 41 | The Aptitude Test | Oskar Gets a Job | October 14, 1998 | Unknown |
| 42 | Curly Snaps | Pre-Teen Scream | September 16, 1998 | Unknown / 143B |
| 43 | Stinky Goes Hollywood | Olga Gets Engaged | September 14, 1998 | 143A / Unknown |
| 44 | Crabby Author | Rich Kid | December 28, 1998 | Unknown / 142B |
| 45 | Helga Blabs It All | Harold the Butcher | August 31, 1998 | Unknown |
| 46 | Arnold Betrays Iggy | Helga and the Nanny | October 19, 1998 | 145B / Unknown |
| 47 | Dangerous Lumber | Mr. Hyunh Goes Country | September 2, 1998 | Unknown |
| 48 | Arnold's Room | Helga vs. Big Patty | September 9, 1998 | Unknown / 148A |
| 49 | Career Day | Hey Harold! | October 21, 1998 | 149A / Unknown |
| 50 | Casa Paradiso | Gerald's Tonsils | September 7, 1998 | Unknown |
| 51 | Phoebe Takes the Fall | The Pig War | December 7, 1998 | Unknown |
| 52 | Best Man | Cool Party | November 2, 1998 | Unknown / 154A |
| 53 | Sid's Revenge | Roller Coaster | October 7, 1998 | Unknown / 155B |
| 54 | Grandpa's Birthday | Road Trip | September 28, 1998 | Unknown / 155A |
| 55 | Arnold & Lila | Grand Prix | November 11, 1998 | Unknown |
| 56 | Arnold's Thanksgiving | November 18, 1998 | 156 | |
| 57 | Girl Trouble | School Dance | January 4, 1999 | Unknown / 153A |
| 58 | Helga's Show | The Flood | November 23, 1998 | Unknown / 158B |
| 59 | School Play | March 8, 1999 | 159 | |
| 60 | Parents Day | May 10, 2000 | 160 | |
Trivia[]
- Despite being produced as part of this season, "Parents Day" was held over in the US for over a year and aired in 2000, as part of Season 5. More information here.
- A deviation between production order and airing order caused a continuity error: "Rich Kid" was supposed to introduce Lorenzo as a new character, but by the time that episode was aired, he had already made appearances in "Gerald's Tonsils" and "Arnold's Room".
- During its original run in 1998-1999, this season aired 20 half-hours. Out of those 20, 19 of them were episodes made for Season 3, and the remaining half-hour were episodes 19a and 26a, produced back in Season 1. It's unclear why those early episodes were held over for so long.
- This is the last season in which Phillip Van Dyke voices Arnold.