Seacon may refer to:

• The 19th World Science Fiction Convention, Seacon, held in Seattle, Washington, in 1961
• The 37th World Science Fiction Convention, Seacon '79, held in Brighton, England, in 1979
• Seacons, Transformers characters
• Seacon Square Srinakarin, a mall located in eastern Bangkok, Thailand
• Seacon Square Bangkae, a mall located in Thonburi Bangkok, Thailand

• Atomic force microscope
• Atomic fountain
• Atomic Garden (band)
• Atomic gardening
• Atomic Garden (song)
• Atomic gravitational wave interferometric sensor
• Atomic G-Shocks
• Atomichron
• Atomic hypothesis
• Atomic instruction
• Atomicities
• Atomicity (chemistry)
• Atomicity, consistency, isolation, durability
• Atomicity (disambiguation)
• Atomicity (programming)
• Atomic (jazz band)
• Atomic lattice (disambiguation)
• Atomic mass
• Atomic Mass band
• Atomic mass/Table
• Atomic model
• Atomic models
• Atomic MPC
• Atomic nucleus
• Atomic number 79