Season 3

The third season of Hey Arnold! includes 34 quarter-hour episodes and 3 half-hour specials, making it the series' longest season.

Episodes

#	Segment A	Segment B	U.S. air date	Production code
41	The Aptitude Test	Oskar Gets a Job	October 14, 1998
42	Curly Snaps	Pre-Teen Scream	September 16, 1998	/ 143B
43	Stinky Goes Hollywood	Olga Gets Engaged	September 14, 1998
44	Crabby Author	Rich Kid	December 28, 1998
45	Helga Blabs It All	Harold the Butcher	August 31, 1998
46	Arnold Betrays Iggy	Helga and the Nanny	October 19, 1998
47	Dangerous Lumber	Mr. Hyunh Goes Country	September 2, 1998
48	Arnold's Room	Helga vs. Big Patty	September 9, 1998
49	Career Day	Hey Harold!	October 21, 1998
50	Casa Paradiso	Gerald's Tonsils	September 7, 1998
51	Phoebe Takes the Fall	The Pig War	December 7, 1998
52	Best Man	Cool Party	November 2, 1998	/ 154A
53	Sid's Revenge	Roller Coaster	October 7, 1998
54	Grandpa's Birthday	Road Trip	September 28, 1998
55	Arnold & Lila	Grand Prix	November 11, 1998
56	Arnold's Thanksgiving		November 18, 1998	156
57	Girl Trouble	School Dance	January 4, 1999
58	Helga's Show	The Flood	November 23, 1998	/ 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 was episode 19, produced back in Season 1. It's unclear why that early episode was held over for so long.