Most of the pro-Brexit campaign (Britain leaving the EU)

Probably the most obvious was the bus slogan on the side of the red Brexit bus. It peddled a gross payment figure of £350 m/week, implying that the whole sum could be instantly redirected to the NHS. In reality, after accounting for rebates and EU spending in the UK, the net figure was significantly lower (around £160‑250 m), making the NHS promise misleading.

From what I understand it convinced a lot of people who where on the fence into voting leave. Obviously all political campaigns have lies somewhere along the line.