"Objection (Tango)" is a song by Colombian singer-songwriter Shakira for her fifth studio album and first English-language album Laundry Service (2001). It was the first song Shakira wrote in English after being encouraged by American singer Gloria Estefan to record material in the language. "Objection (Tango)" musically combines elements of pop rock and tango, and contains instrumentation from the bandoneón and guitar. Through the lyrics of the song, Shakira aims to end a love triangle she is a part of. The song was released as the fourth single from the album on 24 June 2002. A Spanish version of the song, entitled "Te Aviso, Te Anuncio (Tango)" ("I'm Warning You, I'm Telling You"), was also recorded.

Upon its release, "Objection (Tango)" received generally favourable reviews from music critics, some of whom found it similar to the work of American new wave band the B-52's. Commercially, "Objection (Tango)" was a success and peaked inside the top ten of record charts of various countries such as Australia, Belgium, Italy, Netherlands and France. The song became the last single from the album to chart in the United Kingdom and on the Billboard Hot 100 chart in the United States, reaching numbers 17 and 55, respectively. "Te Aviso, Te Anuncio (Tango)" charted inside the top ten of the US Billboard Latin Pop Airplay and Latin Tropical/Salsa Airplay charts. "Objection (Tango)" was certified platinum and gold in Australia and France by the Australian Recording Industry Association (ARIA) and Syndicat National de l'Édition Phonographique (SNEP), respectively.

An accompanying music video for "Objection (Tango)" was directed by Dave Meyers and features Shakira fighting her unfaithful lover and his mistress in a club. A segment of the video is rendered in an animated cartoon-form. For additional promotion, Shakira performed an Afro-punk and Reggae inspired version of the song at the 2002 MTV Video Music Awards. It was also included in the setlist of the Tour of the Mongoose (2002-2003), which was launched to promote Laundry Service, and Las Mujeres Ya No Lloran World Tour (2025). "Objection (Tango)" was also used in a Pepsi commercial featuring Shakira.

In 1998, Shakira released her second major label studio album Dónde Están los Ladrones? (Where Are the Thieves?), which became an immense success in Latin America and received multi-platinum record certifications in various countries like Argentina, Colombia, Chile, Mexico and Spain. The rock en Español-influenced Latin pop album drew comparisons to the work of Canadian-American singer songwriter Alanis Morissette and "cracked the lucrative US market wide open", spending a total of 11 weeks atop the Billboard Top Latin Albums chart. It became Shakira's first album to receive a platinum certification from the Recording Industry Association of America (RIAA). Dónde Están los Ladrones? spawned the Arabian-styled single "Ojos Así" ("Eyes Like Yours"), which became a hit and was deemed the "signature track" of the album.

American singer Gloria Estefan, whose husband Emilio Estefan was managing Shakira at that time, felt that Shakira had the potential to crossover into the mainstream pop industry. However, Shakira was initially hesitant to record songs in English as it was not her first language, so Estefan offered to translate "Ojos Así" into English in order to show her that "it could translate well." Shakira then began translating the song herself and showed it to Estefan, who responded "Quite honestly, I can't do this better!." As Shakira wanted to have full control over her recordings, she decided to learn English better to enable her to write her own songs. Wanting to "find a way to express my ideas and my feelings, my day-to-day stories in English", Shakira bought rhyming dictionaries, started analysing the lyrics of songs by Bob Dylan, reading poetry and the work of authors like Leonard Cohen and Walt Whitman and took English lessons from a private tutor. "Objection (Tango)" became the first song Shakira wrote in English and in an interview with Faze, she talked about the writing process of the song, saying "I prayed and asked God to send me a good song today, and I remember I started writing the song ['Objection (Tango)'] a couple of hours after. I wrote the music and lyrics at the same time, and when that happens it's really magical to me." Shakira also wrote and recorded a Spanish-version of the song entitled "Te Aviso, Te Anuncio (Tango)".

"Objection (Tango)" was released as the third single from Laundry Service in a promotional CD single format on 6 July 2002. It was later released on 27 August as a CD single featuring the previous single from the album "Underneath Your Clothes" as the B-side.

"Objection (Tango)" was written and produced by Shakira, with additional production by Lester Mendez. It is a combination of pop rock and tango, a style of fast-paced ballroom dance music that originated in Argentina and Uruguay. According to the sheet music of "Objection (Tango)" published at MusicNotes.com by Sony/ATV Music Publishing, it is written in the key of B minor and has a half note metronome of 66 beats per minute. Shakira's vocal range spans from E₃ to B₄. The song contains instrumentation from the bandoneón, which is played at a "breakneck speed," and also features a "twanging" guitar solo. Lyrically, "Objection (Tango)" is dramatic and humorous in approach and focuses on an angered Shakira ordering her love interest to choose between her and his other leading lady; it was said to be a feminist anthem and a "hell-hath-no-fury it's-her-or-me steam train". It contains a line in which Shakira asserts to her lover that "Next to her cheap silicone I look minimal/ That's why in front of your eyes I'm invisible/ But you gotta know small things also count," which a critic commented was a "brave statement in these days of suspiciously ripe teenybop flesh peddlers." During the bridge of the song, Shakira delivers rap-like vocals and instructs her lover to end the love triangle, declaring that "Tango is not for three, was never meant to be."

Alex Henderson from AllMusic selected the song as one of the highlights from Laundry Service and commented that "[Shakira] successfully combines pop/rock with [...] tango on 'Objection (Tango)'." Chuck Taylor from Billboard gave it a very positive review, praising Shakira's vocal delivery, the spoken bridge, and its radio-friendly sound, saying that it is "perfectly timed for the singalong days of summer and adds fuel to the bonfire that this amiable talent [Shakira] has ignited." The critic compared "Objection (Tango)" to Puerto Rican singer Ricky Martin's song "Livin' la Vida Loca", and the work of American new wave band the B-52's. Alexis Petridis from The Guardian picked "Objection (Tango)" as an example of Shakira's unusual style of production and opined that it "sounds like the B-52's jamming with a wedding reception combo [sic]." Matt Cibula from PopMatters complimented Shakira's songwriting and termed the song a "fine rockcraft with drama and a sense of humor." The critic too enjoyed the bridge of the song, saying "the little growly semi-rap break at the end is fun as hell." Lisa Oliver from Yahoo! Music, however, felt the song was on the "mingers side" of the album.