Nancy Roos was a U.S. chess champion.

Born Nancy Krotoschin in Belgium, she married Martin Roos.
Before coming to America she was active at the Cercle l'Echiquier in Brussels.
Roos won the U.S. Women's Chess Championship

U.S. Women's Chess Championship

The U.S. Women's Chess Championship tournament is to determine the woman chess champion of the United States.-List of U.S. Women's Chess Champions:*1937 Adele Rivero*1938 Mona May Karff*1940 Adele Rivero*1941 Mona May Karff*1942 Mona May Karff...

 in 1955 with Gisela Kahn Gresser

Gisela Kahn Gresser

Gisela Kahn Gresser was one of the first two female chess players in the United States, and one of the first seventeen players in the world, to be awarded the title of Woman International Master in 1950 when FIDE created official titles. She was also the first American woman to be inducted into...

, both scoring 9–2.
She took second at the Pan-American Tournament in 1954 behind Mary Bain

Mary Bain

Mary Bain was an American chess master.She was a Women's World Chess Championship Challenger in 1937 and 1952 and the first American woman to represent the U.S...

 and Mona May Karff

Mona May Karff

Mona May Karff was an American competitive chess player. Karff dominated U.S. women's chess in the 1940s and early 1950s and had an extended career. She held seven U.S. Women's Chess Champion titles and four consecutive U.S. Open titles.She was born Mona May Ratner in Bessarabia, a province in...

, and tied for second at the 1942 U.S. Women's Championship behind Adele Belcher and Karff.
Roos was a professional photographer and at the time of her death was the second highest rated woman in the U.S. Chess Federation.
She died of cancer in Los Angeles, California.