- Yarmulke (5)
- Yate (1)
- Yates, Gayle Graham (1)
- Yeast (2)
- Yeaton, Dana (2)
- Yellow Birch (1)
- Yellow Crowned Night Heron (1)
- Yellow River Basin (1)
- Yellow Robe, Wiliam S, Jr (1)
- Yellow Sea (1)
- Yellow Whitlow Grass (1)
- Yergan Family (1)
- Yergan, Max, 1892 1975 (18)
- Yergan, Max, 1894 1975 (4)
- Yerkes, Robert Mearns, 1876 1956 (271)
- Yicheng Xian (Shanxi) History Sources (2)
- Yiddish (1)
- Yiddish, Fraternal Organizations (2)
- Yidu Xian (Hubei) History Sources (1)
- Yifeng Xian (Henan) History Sources (4)
