Willem Hendrik van den Bos (25 September 1896 – 30 March 1974) was a Dutch astronomer who worked at the Union Observatory in South Africa and became its director in 1941.
In 1925 he completed his PhD in astronomy under the supervision of Willem de Sitter and was invited by R.T.A.
Innes to join the Union Observatory in Johannesburg for a three-year appointment as assistant to the director, H.E.
Innes was eager to have an experienced observer of double-stars to share the workload on the newly erected telescope.
He retired from the observatory in 1956 but continued his observations both in South Africa and the United States until 1966 when he was forced to stop owing to severe illness.