Sweden was represented in the Eurovision Song Contest 2005 by Martin Stenmarck with the song "Las Vegas". The entrant was chosen through the Swedish national final Melodifestivalen.

Martin was automatically qualified for the Kiev final (thanks to Lena Philipsson's 5th place last year), where he performed 14th. However, the result was disastrous: a joint 19th place (out of 24) with only 30 points; this was the worst placement for Sweden in 13 years.

Four semifinals and one second chance show were broadcast to decide the line-up for the national final in Sweden. As in recent years the qualifying heats were held across Sweden. The Melodifestival started out in Göteborg and travelled through Linköping, Skellefteå, and Växjö before the final. The final was won by Martin Stenmarck with his song "Las Vegas", which was written and composed by Niklas Edberger, Johan Fransson, Tim Larsson and Tobias Lundgren. Nanne, who was the favourite of televoters, came second, as she did not receive enough points from the 11 juries. This caused much controversy in Sweden.

The spokesperson who revealed Sweden's votes for other countries was SVT and radio host Annika Jankell.

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