Alexander Spiers Witcomb (also known as Alejandro S. Witcomb in Argentina; Winchester, 1838 – Buenos Aires, 1905) was a British photographer whose work is considered part of the historical heritage of Argentina, where he established the first photography studio. The Witcomb collection contains about 500,000 negatives, although people from his era stated that the General Archive of the Nation could have received about 700,000 negatives at that time to become part of the Archive collection.