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擲毫或擲硬幣、擲銅板是一種把硬幣彈到空中，透過它落下來後所顯示的結果（落下來後是正面向上還是反面向上），來解決事情的一種方法。

硬币有两面，是一个天然的二进制系统，利用掷硬币人们可以得到一组随机的二进制数字，有些人會把它作为做判断的參考，例如球賽由哪一方先發球，或先選哪半邊場作賽。

外部連結

• 
  Heads or Tails? (A discussion of the predictability of a coin toss; with references)
  


• 
  The Not So Random Coin Toss (Brief blurb about Persi Diaconis' work, with a photograph of the coin-tossing machine)
  


• 
  Dynamical Bias in the Coin Toss (by Persi Diaconis, Susan Holmes, and Richard Montgomery; very detailed)
  


• 
  Whether divination by drawing lots is unlawful? (From the Summa Theologiae of Thomas Aquinas)
  


• 
  The Casting of Lots (Discussion of making decisions by chance outcomes throughout history)
  


• 
  Coin Tossing — mathworld.com (Contains information about counterintuitive properties of coin tossing)
  


• 
  Persi Diaconis' website — including the paper Dynamical Bias in the Coin Toss PDF
  


• Random.org: flip a virtual coin


• Flip-Coin.com: Simple web app to flip a virtual coin


• 
  Leads in Coin Tossing by Fiona Maclachlan, The Wolfram Demonstrations Project.

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