| Birth Place: | Hasselt, Belgium |
| Height: | 1.78m (05.84feet) |
| Weight: | 60kg (130lb) |
| Sport: | Long-distance running |
| Club: | FC Luik |
| Show-Medals: | yes |
Alex Hagelsteens (born 15 July 1956) is a retired Belgian athlete who specialised to long-distance running and cross-country. He competed at the 1980 Summer Olympics in the 5000 and 10000 m events but failed to reach the finals. Hagelsteens was most successful at the Egmond Half Marathon, winning it in 1982 and 1984 and finishing second in 1985 and 1986.