• One-way traffic
• One-way communication: Communication in which information is always transferred in only one preassigned direction. It does not include a return channel. Antonym: two-way or bidirectional.
• One-way function
• One-way mirror, a glass through which one can see only in one way
• One way in travel means purchashing a ticket for a single direction of travel. No ticket is purchased for a return to the starting location for the trip.

One Way as a proper noun may refer to:

• One Way (album), Australian R&B singer Selwyn's second album
• One Way (band), R&B/funk band popular from late 1970s through the 1980s
• One Way (film), director Reto Salimbeni's 2006 film
• One Way Records, music label
• One Way (clothing), casual & leisure wear clothing label