Adentro (English: Inside) is the tenth studio album by Guatemalan singer-songwriter Ricardo Arjona, released on December 6, 2005, by Sony Music Entertainment.

Recorded in the United States and Mexico, the album was produced by Arjona himself, as well as Dan Warner and Lee Levin (under their stage name Los Gringos), Puerto Rican singer-songwriter Tommy Torres, and long-time collaborator Carlos Cabral Jr.

Arjona experimented with prominent Latin sounds for Adentro, such as Mexican and Tejano music on "Mojado", as well as some Colombian and bachata elements on "Adiós Melancolía".

In an interview with Billboard magazine, the singer commented that he first "tested" Torres by sending him the "hookiest and darkest tracks" on the album, "Acompañame A Estar Solo" and "Iluso".

[2] Arjona further commented that Adentro was "a very representative and tremendously complete album," adding that "having different producers made it rich in possibilities.

[8] The tour officially closed in front of more than 100,00 people during the International Fair on 14 September 2007, in the mainland city of Barquisimeto, Venezuela.

[7][10] Arjona founded the Fundación Adentro, a charity organization which provides music and singing education for poor children in Guatemala, in July 2008.

[11] Arjona commented that the main objective of the organization "isn't becoming an important foundation internationally, but to help child reach their dreams.

[15] "A Ti" was later included on Arjona's compilation album Quién Dijo Ayer, as a duet with Italian singer Eros Ramazzoti.

The album received a double platinum certification (Latin) by the Recording Industry Association of America (RIAA), denoting shipments of 200,000 copies.

In Argentina, it was certified five times platinum by Argentine Chamber of Phonograms and Videograms Producers (CAPIF) for sales exceeding 200,000 copies in that country.

AllMusic writer Evan Gutierrez gave it four stars out of five and lauded its "stripped, natural production value", Arjona's "confident" vocal performance, its "relevant-as-ever" lyricism, and the record's sonic palette as brilliantly variant.

"[3] Leila Cobo of Billboard dubbed it lyrically "Arjona's most personal album", favored its rock elements, and praised its cohesiveness.