Alexander Rocke Robertson (May 12, 1841 – December 1, 1881) was a Canadian lawyer, judge, and politician.

Born in Chatham, Canada West, the second son of Alexander Rocke Robertson and Effie Eberts, Robertson attended the Caradoc Academy and then studied law in Chatham.

In 1864, the rules were changed and Robertson was admitted to the bar of Vancouver Island.

He was elected to the Legislative Assembly of British Columbia in 1871 for the electoral district of Esquimalt.

He injured his knee while swimming in the summer of 1881 and had his leg amputated in November 1881.