(distributed computing) A commit operation that has two main steps: requesting the components of a distributed system to notify whether they are able to apply the commit and notify the components to apply it (if all of them notified that they are able to) or to abort it otherwise.

In fluid mechanics, two-phase flow is a flow of gas and liquid — a particular example of multiphase flow.

In transaction processing, databases, and computer networking, the two-phase commit protocol (2PC, tupac) is a type of atomic commitment protocol.

In databases and transaction processing, two-phase locking is a pessimistic concurrency control method that guarantees conflict-serializability.

Two-phase electrical power was an early 20th-century polyphase alternating current electric power distribution system.

Aqueous biphasic systems or aqueous two-phase systems are clean alternatives for traditional organic-water solvent extraction systems.