William Alexander Smith (19 July 1904 – 20 December 1955) was a South African bantamweight professional boxer who competed in the 1920s.

Harris, who had become the first SA flyweight champion when he stopped Marcus Henning in Kimberley on 12 November 1909, found time twice a week to give boxing lessons to orphans in the St George's Home in Johannesburg.

Smith won through to represent South Africa in Paris, together with Roy Ingram, Ernie Eustace and Dick Beland.

After a stay of five months, a despondent Smith decided to return and in 1928 he defeated Young Johnny Brown, Sammy Tucker and Mickey Doyle and drew with Pierre Pothier.

Then he lost in two fights against the slightly lighter Fidel LaBarba (La Barba had also represented USA at the 1924 Paris Olympics, winning Gold as a Flyweight, thus La Barba vs Smith was the first time two Olympic Gold Medalist's faced off in a Professional bout) and was knocked out by a welterweight, Jack Roberts.

He made a determined effort to recapture his old form and outpointed Ernest Wohrer, an Austrian, and then beat Frenchman Maurice Holtzer.

Having retired from boxing, Smith spent several years as salesman and commercial traveller before running the Richmond Hotel in Hamburg, near Roodepoort, on the West Rand.