All National Olympic Committees (NOCs) participated in the Athens Games, as was the case in 1996. Two new NOCs had been created since 1996, and made their debut at these Games (Kiribati, and Timor-Leste), therefore along with the re-appearance of Afghanistan (missing the 2000 Summer Olympics) the total number of participating nations increased from 199 to 202. Also since 2000, Yugoslavia had changed its name to Serbia and Montenegro and its code from YUG to SCG. The number in parentheses indicates the number of participants that NOC contributed.