It has been previously observed that athletes of certain origin nationality dominate particular sports; however, this phenomenon has been less studied in cross-country (XC) skiing, especially with regards to performance-related aspects, such as pacing. The aim of the present study was to examine the effect of nationality on pacing strategies of XC skiers who finished the "Vasaloppet" from 2004 to 2017. We studied 183,919 finishers (19,465 women and 164,454 men), classified into 15 nationalities, i.e. nationalities with number of finishers larger than 0.25% of the total number of finishers. In women, athletes from Russia (7:47:46 h:min:s) were the fastest and athletes from Denmark (10:01:03 h:min:s) the slowest (p