| Doubles | |
|---|---|
| 2018 Torneo Internacional Challenger León | |
| Champions |  Gonzalo Escobar  Manuel Sánchez |
| Runners-up |  Bradley Mousley John-Patrick Smith |
| Final score | 6–4, 6–4 |
Leander Paes and Adil Shamasdin were the defending champions but chose not to defend their title.
Gonzalo Escobar and Manuel Sánchez won the title after defeating Bradley Mousley and John-Patrick Smith 6–4, 6–4 in the final.
Marcelo Arévalo / Miguel Ángel Reyes-Varela (quarterfinals) Bradley Mousley / John-Patrick Smith (final)
Brydan Klein / 
Ruan Roelofse (first round)
Adrián Menéndez Maceiras / Roberto Quiroz (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | M Arévalo MÁ Reyes-Varela | 6 | 64 | [12] | |||||||||||||||||||||||
| WC |  A Gómez L Patiño | 4 | 77 | [10] | 1 | M Arévalo MÁ Reyes-Varela | 6 | 66 | [7] | ||||||||||||||||||
| WC | G Escobar M Sánchez | 6 | 6 | WC | G Escobar M Sánchez | 2 | 78 | [10] | |||||||||||||||||||
 B Lock  F Romboli | 2 | 4 | WC | G Escobar M Sánchez | 6 | 77 | |||||||||||||||||||||
| 4 | A Menéndez Maceiras R Quiroz | 6 | 6 | 4 | A Menéndez Maceiras R Quiroz | 1 | 60 | ||||||||||||||||||||
| PR | N Barrientos  D Petrović | 4 | 2 | 4 | A Menéndez Maceiras R Quiroz | 6 | 77 | ||||||||||||||||||||
| WC | L Gómez T Hank | 4 | 5 | PR |  LD Martínez C Ramírez | 4 | 61 | ||||||||||||||||||||
| PR | LD Martínez C Ramírez | 6 | 7 | WC | G Escobar M Sánchez | 6 | 6 | ||||||||||||||||||||
| Alt |  B Arias  F Peliwo | 2 | 64 | 2 | B Mousley J-P Smith | 4 | 4 | ||||||||||||||||||||
 F Agamenone F Zeballos | 6 | 77 | F Agamenone F Zeballos | 2 | 65 | ||||||||||||||||||||||
R Maytín  D Novikov | 6 | 3 | [10] | R Maytín D Novikov | 6 | 77 | |||||||||||||||||||||
| 3 | B Klein R Roelofse | 3 | 6 | [3] | R Maytín D Novikov | 63 | 6 | [10] | |||||||||||||||||||
| H Hach Verdugo B Schnur | 6 | 6 | 2 | B Mousley J-P Smith | 77 | 4 | [12] | ||||||||||||||||||||
 V Estrella Burgos  S Galdós | 2 | 3 | H Hach Verdugo B Schnur | 5 | 4 | ||||||||||||||||||||||
 D King  R Statham | 3 | 3 | 2 | B Mousley J-P Smith | 7 | 6 | |||||||||||||||||||||
| 2 | B Mousley J-P Smith | 6 | 6 | ||||||||||||||||||||||||
Jay Andrijic and Bradley Mousley were the defending champions, but Andrijic was no longer eligible to participate.
Mousley successfully defended the title with Lucas Miedler, defeating Quentin Halys and Johan-Sébastien Tatlot in the final, 6–4, 6–3.
Lucas Miedler and Bradley Mousley were the defending champions but were no longer eligible to compete in juniors in 2015.
Luke Saville and Jordan Thompson were the defending champions but only Saville chose to defend his title, partnering Bradley Mousley. Saville successfully defended his title.
Matt Reid and John-Patrick Smith were the defending champions but chose not to defend their title.
Mitchell Krueger and Daniel Nguyen were the defending champions but chose not to defend their title.
Guilherme Clezar and Alejandro González were the defending champions but only González chose to defend his title, partnering Luis David Martínez. González lost in the first round to Chen Ti and Bradley Mousley.
Matt Reid and John-Patrick Smith were the defending champions but only Reid chose to defend his title, partnering Steven de Waard. Reid lost in the first round to Andrew Harris and Christopher O'Connell.
Luke Saville and Jordan Thompson were the defending champions but only Saville chose to defend his title, partnering Andrew Whittington. Saville lost in the final to Alex Bolt and Bradley Mousley.
Daniel Masur and Ante Pavić were the defending champions but chose not to defend their title.
Matt Reid and John-Patrick Smith were the defending champions but chose not to defend their title.
Lee Hsin-han and Lu Yen-hsun were the defending champions but chose not to defend their title.
Brydan Klein and Dane Propoggia are the defending champions but chose to defend their title with different partners. Klein partnered Bradley Mousley and lost in the semifinals to Gerard and Marcel Granollers. Propoggia partnered Vijay Sundar Prashanth but lost in the first round to Andrew Harris and Luke Saville.
Bradley Mousley and Luke Saville were the defending champions but chose to defend their title with different partners. Mousley partnered Alex Bolt and successfully defended his title. Saville partnered Matt Reid but lost in the quarterfinals to Max Purcell and Andrew Whittington.
Santiago González and Artem Sitak were the defending champions but chose not to defend their title.
Bradley Klahn and Jackson Withrow were the defending champions but only Klahn chose to defend his title, partnering Robert Galloway. Klahn successfully defended his title.
Sam Querrey was the defending champion, but lost in the second round to Egor Gerasimov.
Alex Bolt and Bradley Mousley were the defending champions but only Mousley chose to defend his title, partnering Akira Santillan. Mousley lost in the first round to Adam and Jason Taylor.
Alex Bolt and Bradley Mousley were the defending champions but only Mousley chose to defend his title, partnering Akira Santillan. Mousley lost in the quarterfinals to Evan Hoyt and Wu Tung-lin.
Andreas Seppi was the defending champion but chose not to defend his title.
Alex Bolt and Bradley Mousley were the defending champions but only Mousley chose to defend his title, partnering Pedro Martínez. Mousley lost in the first round to Hiroki Moriya and Mohamed Safwat.