"Notorious" is a song by British-Irish girl group The Saturdays, released as the lead single from the third studio album, On Your Radar. The song was written by Ina Wroldsen and Steve Mac, who also produced the song. The single was released digitally on 22 May 2011. "Notorious" was recorded in 2011 after the band were looking for a new sound to release in their third album. According to the lyrics in the song the band are loving life, they like to go out and enjoy themselves however they work hard and they all have a bad and naughty side to them. The lyrics of the song has been described as "playful". Vanessa White said the song was a more "grown up" approach to the music they have released before. The group performed the song live for the first time on So You Think You Can Dance and the song received its first radio airplay on The Chris Moyles Show.

"Notorious" received mainly positive reviews from critics. It gained comparisons to the Black Eyed Peas, Rihanna and Kelis. Some critics labelled the song as "quite amazing" and "big" and "a bit Black Eyed Peas-esque". It song was also praised for the big production of the song. Aled Jones described the song as "unexpected" from the group. It has also been said that the all-girl group are bringing a tougher, edgier sound. Yahoo! Music questioned the song if it was enough, stating; "a bad girl", short skirts, nice hair, rave breakdown - but is it enough?".

The single's release was accompanied by a music video, which was filmed in Los Angeles; and the final version of the video premiered on both the band's official website and ITV2 at 8:30am on 19 May 2011. The music video has been described as "sexy secretary look as they knuckle down to a day's work at the office" and "The lift handily opens out into a dance floor where they strut their stuff in front of some appreciative men." However; the music video has been compared to Boots pharmacy advert but "with a better song". In the music video, the band had number of different clothing changing where they went for the secretary look and then later changed into stylish clothes for the clubbing scene. They also released 20 second teasers of the video until the full video was broadcast. Also, before the release of the song each member released "lyric teasers" where they would release some lyrics of the song each day.

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