Arthur Adolf, Count of Posadowsky-Wehner, Baron of Postelwitz (German: Arthur Graf[a] von Posadowsky-Wehner Freiherr[b] von Postelwitz, 3 June 1845 – 23 October 1932) was a German conservative statesman.

He subsequently acquired an agricultural property, and entered politics in 1871, when he became a member of the province government in Posen.

In 1882 he became a member of the Parliament of Prussia, and was appointed Landeshauptmann of Posen in 1885.

He took care of a new voting technique to protect the secrecy of the ballot for the German parliament.

Posadowsky-Wehner was the candidate of the German National People's Party for the Presidency of Germany in 1919, but he lost to Friedrich Ebert.