South Bay may refer to:
In the United States:
- South Bay (San Francisco Bay Area), subregion of the San Francisco Bay Area
- South Bay, Los Angeles, region of Los Angeles County
- South Bay, former name of Fields Landing, California
- South Bay, San Diego, region of San Diego County
- South Bay, Florida, city in Florida
- South Bay (Boston), filled-in former bay in Boston, Massachusetts
- South Bay, Boston, planned development in Boston, Massachusetts
- South Bay (Texas), bay in the Laguna Madre in Texas separated from the Gulf of Mexico by Brazos Island
- Great South Bay on Long Island, New York
In the People's Republic of China:
- South Bay, Hong Kong
- Nam Wan on Tsing Yi Island, Hong Kong ("Nam Wan" literally means South Bay)
- Tai Nam Wan on Tsing Yi Island, Hong Kong ("Tai Nam Wan" literally means Great South Bay)
- Nam Van on the Macau Peninsula, an artificial lake ("Nam Van" literally means South Bay)
In Canada:
- South Bay (Nunavut)
In Antarctica:
- South Bay (Doumer Island)
- South Bay (Livingston Island)
Famous quotes containing the words south and/or bay:
“Biography is a very definite region bounded on the north by history, on the south by fiction, on the east by obituary, and on the west by tedium.”
—Philip Guedalla (1889–1944)
“The very dogs that sullenly bay the moon from farm-yards in these nights excite more heroism in our breasts than all the civil exhortations or war sermons of the age.”
—Henry David Thoreau (1817–1862)