William Beckett may refer to:

• William Beckett (MP) (1784–1863), English politician, Member of Parliament for Leeds and Ripon
• Ernest Beckett, 2nd Baron Grimthorpe (1856–1917), British politician, full name Ernest William Beckett, sometimes referred to as "William Beckett"
• William Beckett (engineer) (1862–1956), British railway engineer and soldier
• Sir Gervase Beckett, 1st Baronet (1866–1937), English politician, full name William Gervase Beckett
• William Beckett (Australian politician) (1870–1965), Victorian state politician
• William Beckett (singer) (born 1985), American singer, frontman of the band The Academy Is...