Sir Charles "Chay" Blyth CBE BEM (born 14 May 1940 ) is a Scottish yachtsman and rower. He was the first person to sail single-handed non-stop westwards around the world (1971), on a 59-foot boat called British Steel .

Chay may refer to:

La Pointe du Chay is a limestone promontory, about 5 kilometres from La Rochelle, France, between the seafront of Aytré and Angoulins.

Pa Chay Vue, (RPA: Paj Cai Vwj or Puas Cai Vwj), commonly referred to as Pa Chay or Batchai, led the Hmong people in the War of the Insane revolt against French rule in French Indochina from 1918 to 1921. He was considered a hero among the Hmong nationalists, but regarded as a crazed man among the French-subdued Hmong, but in present times, he is unanimously considered a national hero.

Pasha Chay (Persian: پاشاچاي‎, also Romanized as Pāshā Chāy and Pāshā Chā’ī) is a village in Ijrud-e Pain Rural District, Halab District, Ijrud County, Zanjan Province, Iran. At the 2006 census, its population was 159, in 42 families.

Aji Chay or Talkheh Rud (Azerbaijani: آجی چای Acıçay, Persian: تلخه رود‎ Talkheh Rud, both meaning "bitter river" ) is a river in Azerbaijan region of Iran. Most of it is in the East Azerbaijan Province.

Darman Chay (Persian: درمان چاي‎, also Romanized as Darmān Chāy) is a village in Qaqazan-e Gharbi Rural District, in the Central District of Takestan County, Qazvin Province, Iran. At the 2006 census, its existence was noted, but its population was not reported.

The Shahar River, also known as Shahar Chay (City River) or Barde Sur (Azerbaijani: Shahar-cay) is a river in the Zagros Mountains of northwestern Iran.

Sufi Chay (صوفی چای) is a river in north-west Iran, at 37° 19' 45" N, 46° 4' 36" E. The river rises at Mount Sahand in the mountains to the east of Lake Urmia, and flows south past Alavian and Senshon till it reaches Maragheh city where it turns east and enters Lake Urmia in a large delta at Bonab.