| Competition: | 3. deild karla |
| Season: | 2024 |
| Winners: | Kári |
| Promoted: | Kári Víðir |
| Relegated: | Ellíði Vængir Júpiters |
| Prevseason: | 2023 |
| Nextseason: | 2025 |
The 2024 3. deild karla (English: Men's Third Division) was the 70th season of fourth-tier Icelandic football. The season began on 3 May and finished on 14 September 2024.
The title winners (Kári) and runners-up (Víðir) were promoted to the 2025 2. deild karla, whilst the bottom two teams (Ellíði and Vængir Júpiters) were relegated to the 2025 4. deild karla.
The league consisted of twelve teams; eight teams remaining from the previous season, two teams promoted from the 4. deild karla, and two teams relegated from the 2. deild karla.
The promoted teams were 2023 4. deild karla champions Vængir Júpiters and runners-up KFK Kópavogur (replacing the 2023 3. deild karla relegated teams KFS and Ýmir). The relegated teams were 2023 2. deild karla bottom two teams KV and Sindri (replacing the 2023 3. deild karla promoted teams Hvöt Blönduós and Reynir).
| Team | Location | Stadium | |
|---|---|---|---|
| Augnablik | Kópavogsvöllur | ||
| Ellíði | Reykjavík (Árbær) | Würth völlurinn | |
| Mosfellsbær | Varmárvöllur | ||
| KFK Kópavogur | Kópavogur | Fagrilundur Gervigras | |
| KV | Reykjavík | KV-Park við Frostaskjól | |
| Magni | Grenivík | Grenivíkurvöllur | |
| Sindri | Höfn | Sindravellir | |
| Vængir Júpiters | Grafarvogur | Fjölnisvöllur | |
| Nesfisk-völlurinn | |||
| Árbær | Reykjavík | Würth völlurinn | |
| ÍH | Hafnarfjörður | Skessan |
Each team played each other twice (22 matches each), once at home and once away.