Alexander Robertson may refer to:
- Alexander Robertson (Canadian politician) (1838–1888), lawyer and politician from Ontario, Canada
- Alexander Rocke Robertson (1841–1881), Canadian politician
- Alexander Black Robertson (1847–?), politician from Ontario, Canada
- Alexander D. Robertson (1849–1921), politician from Prince Edward Island, Canada
- Alex Robertson (footballer) (fl. 1902–1903), Scottish footballer
- Alex Robertson (Australian rules footballer) (1887–1915), Australian rules footballer for University
- Sir Alexander Robertson (police officer) (died 1970), British police officer, Deputy Commissioner of Police of the Metropolis, 1958–1961
- Alexander Robertson (MP) (1779–1856), British Member of Parliament for Grampound
- Alexander Robertson (chemist) (1896–1970), British chemist
- Alexander Robertson, the name of several chiefs of Clan Donnachaidh