Athletics
A single athlete represented Iceland in athletics in the nation's debut at the sport and the Olympics. Halldórsson ran in the 100 metres, finishing fourth in his first round heat and not advancing to the semifinals.
Ranks given are within that athlete's heat for running events.
| Athlete | Events | Heat | Semifinal | Final | |||
|---|---|---|---|---|---|---|---|
| Result | Rank | Result | Rank | Result | Rank | ||
| Jón Halldórsson | 100 m | 12.4 | 4 | Did not advance | |||
Read more about this topic: Iceland At The 1912 Summer Olympics