| Season | Episode Title | Air Date | Air Time | Channel | Country | #Creds | #Pics |
|---|
| 1 | The Great Debate | 09/09/1975 | 8:30 pm | ABC | USA | | |
| 1 | Basket Case | 09/16/1975 | 8:30 pm | ABC | USA | | |
| 1 | Welcome Back (Pilot) | 09/23/1975 | 8:30 pm | ABC | USA | 10 | |
| 1 | Whodunit? | 09/30/1975 | 8:30 pm | ABC | USA | | |
| 1 | The Election | 10/07/1975 | 8:30 pm | ABC | USA | | |
| 1 | No More Mr. Nice Guy | 10/14/1975 | 8:30 pm | ABC | USA | | |
| 1 | Classroom Marriage | 10/21/1975 | 8:30 pm | ABC | USA | | |
| 1 | One of Our Sweathogs Is Missing | 10/28/1975 | 8:30 pm | ABC | USA | | |
| 1 | Mr. Kotter, Teacher | 11/04/1975 | 8:30 pm | ABC | USA | | |
| 1 | The Reunion | 11/18/1975 | 8:30 pm | ABC | USA | | |
| 1 | Barbarino's Girl | 11/25/1975 | 8:30 pm | ABC | USA | | |
| 1 | California Dreamin' | 12/02/1975 | 8:30 pm | ABC | USA | | |
| 1 | Arrividerci, Arnold | 12/16/1975 | 8:30 pm | ABC | USA | | |
| 1 | The Longest Weekend | 01/06/1976 | 8:00 pm | ABC | USA | | |
| 1 | The Sit-In | 01/13/1976 | 8:00 pm | ABC | USA | | |
| 1 | Follow the Leader: Part 1 | 01/20/1976 | 8:00 pm | ABC | USA | | |
| 1 | Follow the Leader: Part 2 | 01/22/1976 | 8:00 pm | ABC | USA | | |
| 1 | Dr. Epstein, I Presume | 01/29/1976 | 8:00 pm | ABC | USA | | |
| 1 | One Flu Over the Cuckoo's Nest | 02/05/1976 | 8:00 pm | ABC | USA | 13 | 13 |
| 1 | The Telethon | 02/12/1976 | 8:00 pm | ABC | USA | | |
| 1 | Kotter Makes Good | 02/19/1976 | 8:00 pm | ABC | USA | | |
| 1 | Father Vinnie | 02/26/1976 | 8:00 pm | ABC | USA | 10 | 10 |
| 2 | Career Day | 09/23/1976 | 8:00 pm | ABC | USA | | |
| 2 | Inherit the Halibut | 09/30/1976 | 8:00 pm | ABC | USA | | |
| 2 | Sweatside Story | 10/07/1976 | 8:00 pm | ABC | USA | | |
| 2 | The Fight | 10/21/1976 | 8:00 pm | ABC | USA | | |
| 2 | The Museum | 10/28/1976 | 8:00 pm | ABC | USA | | |
| 2 | Gabe Under Pressure | 11/04/1976 | 8:00 pm | ABC | USA | | |
| 2 | Sweathog, Nebraska Style | 11/11/1976 | 8:00 pm | ABC | USA | | |
| 2 | Sadie Hawkins Day | 11/18/1976 | 8:00 pm | ABC | USA | | |
| 2 | Hello Ms. Chips | 12/02/1976 | 8:00 pm | ABC | USA | | |
| 2 | Horshack vs. Carvelli | 12/09/1976 | 8:00 pm | ABC | USA | | |
| 2 | Sweathog Clinic for the Cure of Smoking | 12/16/1976 | 8:00 pm | ABC | USA | | |
| 2 | Hark, the Sweatkings | 12/23/1976 | 8:00 pm | ABC | USA | | |
| 2 | A Love Story | 12/30/1976 | 8:00 pm | ABC | USA | | |
| 2 | Caruso's Way | 01/06/1977 | 8:00 pm | ABC | USA | | |
| 2 | Sweatgate Scandal | 01/13/1977 | 8:00 pm | ABC | USA | | |
| 2 | Kotter and Son | 01/20/1977 | 8:00 pm | ABC | USA | | |
| 2 | Chicken a la Kotter | 01/27/1977 | 8:00 pm | ABC | USA | | |
| 2 | Has Anyone Seen Arnold? | 02/03/1977 | 8:00 pm | ABC | USA | | |
| 2 | The Littlest Sweathog | 02/10/1977 | 8:00 pm | ABC | USA | | |
| 2 | Radio Free Freddie | 02/17/1977 | 8:00 pm | ABC | USA | | |
| 2 | I'm Having Their Baby | 02/24/1977 | 8:00 pm | ABC | USA | | |
| 2 | I Wonder Who's Kissing Gabe Now | 03/03/1977 | 8:00 pm | ABC | USA | | |
| 3 | Sweathog Back-to-School Special | 09/10/1977 | 8:00 pm | ABC | USA | | |
| 3 | And Baby Makes Four: Part 1 | 09/15/1977 | 8:00 pm | ABC | USA | | |
| 3 | And Baby Makes Four: Part 3 | 09/22/1977 | 8:00 pm | ABC | USA | | |
| 3 | Brother, Can You Spare a Million? | 09/29/1977 | 8:00 pm | ABC | USA | | |
| 3 | Just Testing | 10/06/1977 | 8:00 pm | ABC | USA | | |
| 3 | The Deprogramming of Arnold Horshack | 10/13/1977 | 8:00 pm | ABC | USA | | |
| 3 | What a Move | 10/20/1977 | 8:00 pm | ABC | USA | | |
| 3 | A Novel Idea | 10/27/1977 | 8:00 pm | ABC | USA | | |
| 3 | Barbarino in Love: Part 1 | 11/03/1977 | 8:00 pm | ABC | USA | | |
| 3 | Barbarino in Love: Part 2 | 11/10/1977 | 8:00 pm | ABC | USA | | |
| 3 | Kotter for Vice Principal | 11/17/1977 | 8:00 pm | ABC | USA | | |
| 3 | Swine and Punishment | 11/24/1977 | 8:00 pm | ABC | USA | | |
| 3 | Epstein's Madonna | 12/08/1977 | 8:00 pm | ABC | USA | | |
| 3 | A Sweathog Christmas Special | 12/15/1977 | 8:00 pm | ABC | USA | | |
| 3 | Sweatwork | 12/22/1977 | 8:00 pm | ABC | USA | | |
| 3 | Meet Your New Teacher: Batteries Not Included | 01/05/1978 | 8:00 pm | ABC | USA | | |
| 3 | Angie | 01/12/1978 | 8:00 pm | ABC | USA | | |
| 3 | Epstein's Term Paper | 01/19/1978 | 8:00 pm | ABC | USA | | |
| 3 | There's No Business: Part 1 | 01/26/1978 | 8:00 pm | ABC | USA | | |
| 3 | There's No Business: Part 2 | 02/02/1978 | 8:00 pm | ABC | USA | | |
| 3 | What Goes Up | 02/09/1978 | 8:00 pm | ABC | USA | | |
| 3 | Goodbye, Mr. Kripps | 02/16/1978 | 8:00 pm | ABC | USA | | |
| 3 | Horshack and the Madame X | 02/23/1978 | 8:00 pm | ABC | USA | | |
| 3 | The Kiss | 03/09/1978 | 8:00 pm | ABC | USA | | |
| 3 | The Return of Hotsy Totsy | 05/11/1978 | 8:00 pm | ABC | USA | | |
| 3 | Class Encounters of the Carvelli Kind | 05/18/1978 | 8:00 pm | ABC | USA | | |
| 4 | The Drop-Ins: Part 1 | 09/11/1978 | 8:00 pm | ABC | USA | 8 | |
| 4 | Don't Come Up and See Me Sometime | 09/25/1978 | 8:00 pm | ABC | USA | 8 | |
| 4 | Once Upon a Ledge | 10/02/1978 | 8:00 pm | ABC | USA | 6 | |
| 4 | The Sweatmobile | 10/09/1978 | 8:00 pm | ABC | USA | 10 | |
| 4 | Beau's Jest | 10/16/1978 | 8:00 pm | ABC | USA | 7 | |
| 4 | Barbarino's Boo-Boo | 10/21/1978 | 8:00 pm | ABC | USA | 10 | |
| 4 | X-Rated Education | 10/28/1978 | 8:00 pm | ABC | USA | 8 | |
| 4 | The Barbarino Blues | 11/03/1978 | 8:00 pm | ABC | USA | 7 | |
| 4 | Washington's Clone | 11/11/1978 | 8:00 pm | ABC | USA | 5 | |
| 4 | Frog Day Afternoon | 11/25/1978 | 8:00 pm | ABC | USA | 6 | |
| 4 | A Little Fright Music | 12/02/1978 | 8:00 pm | ABC | USA | 6 | |
| 4 | A Winter's Coat Tale | 12/16/1978 | 8:00 pm | ABC | USA | 7 | |
| 4 | Bride and Gloom | 01/13/1979 | 8:00 pm | ABC | USA | 7 | |
| 4 | Barbarino's Baby | 02/03/1979 | 8:30 pm | ABC | USA | 9 | |
| 4 | The Goodbye Guy | 02/10/1979 | 8:30 pm | ABC | USA | 6 | |
| 4 | Come Back, Little Arnold | 02/24/1979 | 8:30 pm | ABC | USA | 8 | |
| 4 | The Sweat Smell of Success | 03/03/1979 | 8:30 pm | ABC | USA | 7 | |
| 4 | The Gang Show | 03/17/1979 | 8:30 pm | ABC | USA | 7 | |
| 4 | Oo, Oo, I Do: Part 1 | 05/25/1979 | 8:30 pm | ABC | USA | 6 | |
| 4 | I'm Okay, But You're Not | 06/01/1979 | 8:30 pm | ABC | USA | 5 | |
| 4 | The Breadwinners | 06/08/1979 | 8:30 pm | ABC | USA | 8 | |