| Kobi Nachtailer | |
| Fullname: | Jacov Nachtailer |
| Birth Date: | 9 November 1978 |
| Birth Place: | Israel |
| Position: | Defender |
| Youthclubs1: | Maccabi Tel Aviv |
| Youthclubs2: | Hapoel Tel Aviv |
| Years1: | 1997–1999 |
| Clubs1: | Hapoel Tel Aviv |
| Caps1: | 10 |
| Years2: | 1999–2000 |
| Clubs2: | Maccabi Sha'arayim |
| Years3: | 2000–2001 |
| Clubs3: | Beitar Be'er Sheva |
| Years4: | 2001–2002 |
| Clubs4: | Hapoel Petah Tikva |
| Caps4: | 25 |
| Goals4: | 1 |
| Years5: | 2002–2003 |
| Clubs5: | Hapoel Kfar Saba |
| Caps5: | 18 |
| Goals5: | 0 |
| Years6: | 2003–2004 |
| Clubs6: | Maccabi Tel Aviv |
| Caps6: | 0 |
| Goals6: | 0 |
| Years7: | 2004 |
| Clubs7: | VfL Osnabrück |
| Caps7: | 12 |
| Goals7: | 0 |
| Years8: | 2004–2006 |
| Clubs8: | Hapoel Nazareth Illit |
| Caps8: | 42 |
| Goals8: | 1 |
| Years9: | 2006–2007 |
| Clubs9: | FC Vaslui |
| Caps9: | 8 |
| Goals9: | 0 |
| Nationalyears1: | 1994 |
| Nationalteam1: | Israel U16 |
| Nationalcaps1: | 45 |
| Nationalgoals1: | 1 |
Kobi Nachtailer (Hebrew: קובי נכטיילר; born 9 November 1978) is an Israeli former professional footballer who played as a defender. He was the first Israeli to play an official match for a Romanian football club.
On 9 August 1994, Nachtailer made his debut for the Israel U16 team against the Hungary U16 in a competition hosted by the Hungarian Football Federation. After that he had 57 games in the U16 to U18 national teams.