The track holds off Olly Murs Dance With Me Tonight, which is a new entry at No.2 in the Week 47 list.
It's We Found Love's eighth week on the chart, and its sixth at No.1 in total.
Flo Rida's Good Feeling drops one place to No.3, whilst the song that inspired it, Avivii's Levels, debuts at No.4.
Meanwhile, Kelly Rowland's Down For Whatever arrives at No.6, behing Labrinth and Tinie Tempah's Earthquake, which drops once place into No.5.
Rebecca Ferguson's Nothing's Real But Love, on Sony's Epic label, debuts at No.10.
Music Week subscribers can read the full Official UK Top 75 Singles Chart with in-depth information on each track.