William Dalby (January 28, 1839 – January 22, 1916)^[1] was a merchant, real estate agent, insurance agent, and a political figure in British Columbia, Canada.

He was born in Richmond Hill, Upper Canada and came to Victoria with merchant John Grant in 1862, later Mayor of Victoria. Dalby established a tannery and manufacturing business there. He was a justice of the peace and president of the Agricultural Association. Dalby was a Grand Master in the Masonic lodge of British Columbia.^[2] He was married twice: to Sarah Jane Robinson Moody, the sister of Sewell Moody, in 1866 and to Susan Netherby in 1889. In 1893 he was a member of the firm of Dalby and Claxton, Financial and Cannery Agents, at 64 Yates St.^[3] He died at home in Victoria at the age of 76.^[4] His son married a cousin of chief trader James Murray Yale and Major George Henry Yale.

He was mayor of Victoria, British Columbia from April 15, 1873 when he was selected to replace mayor James D. Robinson to 1875.^[5] Dalby was also an unsuccessful candidate for a seat in the provincial legislature in 1871 and in 1890.^[1]