Leña gruesa is the third album from the Chilean musical group Quelentaro, formerly known as Conjunto Quelentaro. It was released in 1969 on the EMI Odeón Chile label (catalog no. LDC 35170). The album was part of a transition stage for the group with Gastón Guzmán and Valericio Leppe doing the singing. The entirety of Side A is the 16-minute title track, "Leña gruesa", written by brothers, Gastón Guzmán and Eduardo Guzmán. The album was re-released in 1993 on cassette and compact disc.