|Hey Arnold!: Season 3|
Hey Arnold! Season 3 is the third season of the Hey Arnold! series. It includes 34 quarter-hour episodes and 3 half-hour episodes.
- 41. The Aptitude Test / Oskar Gets a Job
- 42. Curly Snaps / Pre-Teen Scream
- 43. Stinky Goes Hollywood / Olga Gets Engaged
- 44. Crabby Author / Rich Kid
- 45. Helga Blabs It All / Harold the Butcher
- 46. Arnold Betrays Iggy / Helga and the Nanny
- 47. Dangerous Lumber / Mr. Hyunh Goes Country
- 48. Arnold's Room / Helga vs. Big Patty
- 49. Career Day / Hey Harold!
- 50. Casa Paradiso / Gerald's Tonsils
- 51. Phoebe Takes the Fall / The Pig War
- 52. Best Man / Cool Party
- 53. Sid's Revenge / Roller Coaster
- 54. Grandpa's Birthday / Road Trip
- 55. Arnold & Lila / Grand Prix
- 56. Arnold's Thanksgiving
- 57. Girl Trouble / School Dance
- 58. Helga's Show / The Flood
- 59. School Play
- 60. Parents Day
- Strangely, despite being produced as part of this season, "Parents Day" was held over for over a year and aired in 2000, as part of Season 5.
- A deviation between production order and airing order caused a continuity error: "Rich Kid" was supposed to introduce Lorenzo as a new character, but he had already made appearances in "Gerald's Tonsils" and "Arnold's Room".
- During its original run in 1998 and 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 was episode 19, produced back in Season 1. It's unclear why that early episode was held over for so long.