Winifred Wagner (born Winifred Marjorie Williams; 23 June 1897 – 5 March 1980) was the English-born wife of Siegfried Wagner, the son of Richard Wagner, and ran the Bayreuth Festival after her husband’s death in 1930 until the end of World War II in 1945. She was a friend and supporter of Adolf Hitler (himself a Wagner enthusiast), and she and Hitler maintained a regular correspondence.
The photo also includes the Head Conductor for 1936 and 1937, Heinz Tietjen (the rather arrogant looking guy standing at the back – number 9). Also there is classic pianist Lotte Ganke (number 6), along with 8 other listed from the group photo. It is not known if this photo actually belonged to Winifred Wagner, but it is presumed that at one time it was the property of one of those shown in the photo.