Bayron Efrén Piedra Avilés (born August 19, 1982 in Cuenca) is an Ecuadorian middle distance and long-distance runner.

He decided to run in both the 1500 m and 5000 m races at the 2009 World Championships in Athletics but he did not succeed in either event, finishing third last in the heats of the 1500 m and failing to finish at all in the 5000 m He has medalled at regional competitions a number of times.

He took part in the 2003 Pan American Games and reached the 1500 m final, finishing in eighth.

In 2004, he came within a second of scoring a long race/short race double at the South American Cross Country Championships, but Juan Suárez of Argentina just finished ahead of him in the short competition.

[2] He improved upon his past performance by taking a bronze in the 2007 Pan American Games.