Anna Maria Walker (née Patton) (c. 1778–1852) and her husband Colonel George Warren Walker (1778–1843) were Scottish botanists in Ceylon (now Sri Lanka) who made extensive collections of plants between 1830 and 1838. Several species of ferns and orchids were named after them by Sir William Jackson Hooker with whom they corresponded. They also corresponded with and collaborated with other botanists in the region such as Robert Wight. Anna Maria was also an excellent botanical artist who illustrated many species of orchids. Plant species named after them include Vanilla walkeriae, and .