Domitia Decidiana was a Roman woman who lived in the 1st century.
In 62 she married the Roman general Gnaeus Julius Agricola, who had just recently returned from service in Britain as a military tribune.
She gave birth to a son, whose name is not known, in 63, and in 64 to a daughter, Julia Agricola.
Agricola and Domitia had another son in 83, who died within a year.
She survived him when he died in 93, and was named as co-heir, along with Julia and the emperor Domitian, in his will.