"Lego House" is a song by English singer-songwriter Ed Sheeran. It was released on 11 November 2011 as the third single lifted from his debut studio album + (Pronounced "Plus") of 2011. It was released as the second single in the US on 11 February 2013. It was written by Sheeran, Jake Gosling and Chris Leonard, and produced by Jake Gosling.

The song received its first radio play on Zane Lowe's BBC Radio 1 show on 8 September 2011 and was Sheeran's first song to make the BBC Radio 2 playlist. The remix featuring P Money premiered on MistaJam's BBC Radio 1Xtra show on 30 September 2011. The music video features Harry Potter actor Rupert Grint, as a play on their similar appearance. The song did fairly well worldwide, reaching top 5 on Australia, Ireland, New Zealand, and the UK Singles Chart, and top 50 on other countries including United States.

According to the sheet music published by Jordan James EMI Music Publishing, "Lego House" is a bass song written in the key of B major; Sheeran's vocals range from the note of B₃ to G#₄. Instrumentation is provided by guitar and piano.

The video for "Lego House" was filmed at the Forum, University of Hertfordshire. It stars actor Rupert Grint. It was released on 20 October 2011 on Sheeran's YouTube channel.

The video's narrative at first portrays Grint as Sheeran, performing such activities as writing lyrics for the song on a pad of paper, lounging in his tour bus, and ultimately taking the stage for a cheering crowd. However, after Grint takes the stage and he is immediately tackled by security, it is slowly revealed that Grint is actually stalking Sheeran and is an obsessive fan, and that the events of the video were actually him stalking the real Ed Sheeran with increasing severity and mental instability (writing the song was actually transcribing the lyrics from the album cover, and lounging in the bus was him breaking into it), ending with Sheeran and Grint meeting as Grint is forcibly removed from a music venue and Sheeran comes out of a lift.

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