Järnaloppet is a short cross-country running event held in September at Järna IP / Ljungbackens IP in Järna, Sweden. The race distances range from 700 m for children's races to 5 km and 10 km for men and women. The event includes categories for children, para-athletes, and recreational runners.
The courses consist of varying numbers of laps on a marked trail adjacent to Järna IP, indicated by ribbons and arrows instead of an officially measured road. Most participants use chip timing, though the para race is timed manually. Results are posted for older youth and adult categories. Järna Sportklubb organizes the event, providing medals for younger runners and podium finishers in other classes.