Echo I or Echo 1 or variant, may refer to:

• Echo I-class submarine of the Soviet Navy
• Echo 1, a 1960 NASA Project Echo passive communications satellite that failed to make it to space
• Echo 1A, a 1960 NASA Project Echo passive communications satellite that was NASA's first comm satellite, thus also referred to as "Echo 1"

See also

• EchoStar I, a 1990s communications satellite
• Echo (disambiguation)