Churn may mean:

• Churn (river), a river running through Gloucestershire
• Butter churn, a device used for churning butter
• Churn rate, the average number of customers that leave a subscription service during a year
• Churn (economics), the process by which jobs are regularly created and destroyed as technology changes
• Churn (album), a 1993 music album by New Zealand rock band Shihad
• Churn (sports), process of customers reinvesting sucessful horse racing wagers, known as handle, back into future wagers

Churning may refer to:

• Churning (stock trade), the excessive buying and selling of stocks by a trader such as a broker to generate large commission fees.
• Churning (butter), the process of creating butter out of milk or cream