"Ignorance" is a song by American rock band Paramore. It was released in July 7, 2009 as the lead single from the band's third studio album, Brand New Eyes (2009). The song impacted radio on July 28. The song was written by band's members Hayley Williams and Josh Farro, although Paramore is credited as being co-writers of the song. The track, recorded in early 2009, was the first song to be written for the album.

Musically, "Ignorance" is an alternative rock song. Farro's and Williams's inspiration for writing the song was from personal experiences. The song received positive reviews from critics for its energy-filled musicianship. "Ignorance" had minor success on the Billboard Hot 100, peaking at number 67. It also charted at numbers 7 and 20 on the Hot Modern Rock Tracks and Hot Rock Songs charts respectively. On March 24, 2016, the song was certified gold in the United States for selling 500,000 copies. The song's international chart performance fared better, peaking within the top 20 of British, Dutch and Japanese charts. A music video for "Ignorance" was released in August 2009. In the video, the band is shown playing in a room with the only source of lighting being a hanging light bulb.

James Montgomery of MTV News viewed the song as lyrically being about the "destructive nature of gossip, about the ugly, tear-'em-down world in which Paramore exist." "Ignorance" was the first song written for Brand New Eyes. In an interview with Kerrang!, Williams, who co-wrote the song, discussed the song's meaning, and her and Farro's inspiration for writing the song, saying,

"In my eyes, this song is a huge turning point for the band. The truth of it is, growing up is not easy. We’re five different people who have to work towards the same goal on a daily basis. There were a lot of times when I felt really alone or angry or insecure. I don’t always feel good at confronting people, especially people that I love, like these guys. Sometimes it takes songs to get the point across. The song is from one person’s perspective. It’s unfair that I’m the one who gets to talk about it but it helped me a lot. The line ‘ignorance is your new best friend’ is about how I felt I was losing people, and I think the band did too. But it’s okay, we’re growing up. I love that song."

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