Sir William Wedderburn, 4th Baronet, JP DL (25 March 1838 – 25 January 1918) was a British civil servant and politician who was a Liberal Party member of Parliament (MP).

His grandfather, Sir David, had had the title of the Wedderburn baronetcy restored to the family, following the attainder after the Jacobite rising of 1745 and the subsequent regain of fortune via the slave sugar plantations of Jamaica.

His older brother John had been killed in the 1857 uprising and William joined the service in 1860 after ranking third (of 160 applicants) in the entrance exam of 1859.

During his work he noted the troubles of peasantry arising from moneylending and he suggested that co-operative agricultural banks be established to provide credits at reasonable rates.

Wedderburn supported reforms suggested by Lord Ripon to develop local self-government and equality to Indian judges.

[5] In 1910 he returned to India as Congress president and tried to solve the rift between Hindus and Muslims and attempted to reconcile the differences between those who wished to work constitutionally and those who wanted to use more militant actions.