Alherdus

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{{Infobox Christian leader

| type = Bishop

| name = Aldherdus

| title = Bishop of Elmham

| image =

| alt =

| caption =

| religion = Christian

| appointed = before 785

| term_end = after 805

| predecessor = Æthelwulf

| successor = Sybba

| consecration = before 785

| death_date = after 805

}}

Aldherus{{efn|Or Alhheard or Ealheard or Ealhheard}} was a medieval Bishop of Elmham.

Aldherus was consecrated before 785 and died sometime after 805.{{cite book |author1=Fryde, E. B. |author2=Greenway, D. E. |author3=Porter, S. |author4=Roy, I. |title=Handbook of British Chronology |edition=3rd |publisher=Cambridge University Press |location=Cambridge |year=1986 |isbn=0-521-56350-X |page=216}}