Yam may refer to:

• Yam (vegetable), the common name for members of genus Dioscorea
• A colloquial name for the sweet potato (Ipomoea batatas), particularly in the United States
• The New Zealand name for the vegetable oca
• Yam (route), Genghis Khan and the Mongols' supply point system
• Yam (god), the Levantine god of the untamed sea
• Yam Cake (Wu Tow Ko), a very popular cake in Malaysia
• A term used on the streets for ounces of the drug cocaine

• YAM (Yet Another Mailer), an email client for the Amiga computer