| Iván Santillán | |
| Fullname: | Iván Diego Santillán Atoche |
| Birth Date: | 6 May 1991 |
| Birth Place: | Talara, Peru |
| Height: | 1.77 m |
| Currentclub: | Universitario |
| Clubnumber: | 16 |
| Position: | Left back |
| Youthyears1: | –2008 |
| Youthclubs1: | Coronel Bolognesi |
| Years1: | 2009–2011 |
| Clubs1: | Coronel Bolognesi |
| Caps1: | 49 |
| Goals1: | 7 |
| Years2: | 2012–2018 |
| Clubs2: | Real Garcilaso |
| Caps2: | 222 |
| Goals2: | 15 |
| Years3: | 2019 |
| Clubs3: | Veracruz |
| Caps3: | 9 |
| Goals3: | 1 |
| Years4: | 2020–2022 |
| Clubs4: | Universitario |
| Caps4: | 46 |
| Goals4: | 4 |
| Years5: | 2023– |
| Clubs5: | Cienciano |
| Caps5: | 12 |
| Goals5: | 0 |
Iván Diego Santillán Atoche (born 6 May 1991) is a Peruvian footballer who plays as a left back for Peruvian Liga 2 club Comerciantes FC.
Santillán came from the youth ranks of Coronel Bolognesi, where he also began his senior career in 2009.[1] He made his Torneo Descentralizado league debut in round 2 at home against Alianza Lima. Manager Roberto Mosquera put Santillán in late in the match for Javier Chumpitaz, but in the end his side lost 1–2.[2] In his fourth match, he made his first league start, playing the entire game in the 1–4 defeat to CD Universidad San Martin.[3] He finished his debut season in the top-flight with nine league appearances,[1] but with his team being relegated. In 2010, Santillán played in the Second Division, with irregular performances, but had a remarkable campaign in the 2011 season.
In January 2012, Santillán joined newly promoted side Real Garcilaso, where he was given the number 27 jersey and was expected to compete with Hugo Ángeles for a spot in the starting XI. However, he was initially sent to play with the reserve team, eventually playing with the first team under manager Freddy García.
After much controversy, Santillán was sold to Tiburones Rojos de Veracruz in January 2019. In 2020, Santillán went back to Peru to play for Universitario.