William Otto Brunner

William Otto Brunner (7 July 1878 – 1 December 1958) was a Swiss astronomer.

From 1926 until 1945 he was the director of the Swiss Federal Observatory. He continued the series of Zürich sunspot observations that was begun in 1864 by the observatory founder, Rudolf Wolf. (These observations continue up to the present.)

The crater Brunner on the Moon is named after him.