The 2005 Lakeside World Professional Darts Championship was held from 1–9 January 2005 at the Lakeside Country Club in Frimley Green, Surrey.

Raymond van Barneveld lifted the title for a fourth time, defeating England captain Martin Adams 6–2 in the final.

The defending champion Andy Fordham suffered a first round loss to Vincent van der Voort.

The women's event saw Trina Gulliver win her fifth successive title defeating Francis Hoenselaar 2–0 in a repeat the last year's final.

There was also a shared 9 Dart Checkout prize of £52,000, along with a High Checkout prize of £2,000 per event.