"On a Mission" is a song by Australian singer-songwriter Gabriella Cilmi from her second studio album, Ten (2010). The song was released as the album's lead single in Australia on 5 February 2010 and in the United Kingdom on 7 March 2010. The song has been praised by music critics for its disco/electronic-oriented sound. Its accompanying music video was directed by Michael Gracey and is heavily inspired by the 1968 science fiction film Barbarella. A remix of the song features American rapper Eve.

In an interview with Digital Spy music editor Nick Levine, Cilmi said, "I guess it will surprise people who thought I was going to make 'Sweet About Me' part two. I surprised myself when I recorded 'On a Mission' and it totally shifted the whole album in a new direction. I've loved playing it to all my friends and watching their reactions—they certainly weren't expecting it either." She added, "I like to think of it as 'I Will Survive' for the 21st century. It's about unleashing your inner superhero and doing what you gotta do to get where you need to be - no matter how many brick walls you have to smash along the way. I really wanted to make a track with a disco influence too and something that would go OFF live! And it's not just for women—I actually co-wrote it with a big bald guy!"

In an interview with BBC News, Cilmi also admitted to borrowing the bassline from Joe Jackson's hit single "Steppin' Out". This is especially obvious in the song's introduction.

The song has received generally positive reviews from music critics. Jon O'Brien from Allmusic said that: " The lead single "On a Mission," a gloriously camp retro-fueled anthem, manages to evoke the spirit of Olivia Newton-John's "Xanadu," Toni Basil's "Mickey," and the Bangles' "Walk Like an Egyptian," all in one Hi-NRG three-minute song. It's a bold statement of intent that indicates from the offset that far from the half-expected tortured singer/songwriter vibe, Ten is only concerned with having fun". Nick Levine from Digital Spy reviewed the song positively, stating that "it's a proper pop stomper that sounds like something the Pointer Sisters could have had a hit with in 1982. Well, kind of. There are Casio-ish synths on the verses, the bridges take the song into disco territory, and it's got a big, guitar-driven chorus that grabs you on first listen." Later, he gave to the song 4 stars (out of 5) and completes the review, saying that the song is "instantly satisfying, moreish too and just as cheesy as it needs to be".Popjustice named "On a Mission" their Song of the Day on 6 January 2010, further commenting that the song sounds like "a chart-friendly mix of Blondie, Joan Jett, Van Halen and Lil' Chris." It also was ranked the 45th best single of 2010 by Popjustice.

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