Seaton Sound, Inc. is a small-batch loudspeaker manufacturer founded in 2005 by Mark Seaton and based in the Chicago area (Morton Grove/Niles, Illinois). The company designs and assembles high-performance subwoofers and speakers primarily aimed at home theater and high-end home audio enthusiasts, with most cabinets built locally in the United States.

Its catalog centers on the SubMersive line of sealed subwoofers (including the SubMersive HP+ and SubMersive F2+), the modular F18+ and F18-Slave system, and the compact JS-12. On the speaker side, Seaton offers the Catalyst 12C and 8C, along with the Spark and Ember series. Products are sold direct and through a small dealer network, often used in dedicated cinema rooms and custom installations where deep low-frequency extension and high dynamic output are priorities.

Founder Mark Seaton is an active voice in audio enthusiast communities such as AVS Forum, What's Best Forum, and AV Nirvana, and the brand has built a following largely through word-of-mouth in those circles rather than mass retail.

Seaton Sound has 2 products cataloged on Equipboard, including Studio Subwoofers.