Circles Drum Samples is a sample library company founded in 2016 by drummer Stefan Runstrom and based in Fort Collins, Colorado. Operating under Circles Audio LLC, the company specializes in producing drum sample packs, loops, and virtual instrument presets recorded with vintage and analog gear. Runstrom performs the drumming on the libraries, with engineer Tyler Lindgren handling recording duties since 2018.

The catalog spans roughly two dozen libraries covering a wide range of styles and aesthetics, including the DEAD series (dry, close-mic'd kits recorded in a small room with analog outboard), Drum Room (full-size kits captured with high-end analog gear), Tape, Dirt, 1987, and Vintage Drum Machine, which sampled the Wurlitzer Sideman — one of the earliest commercial drum machines. Samples are sold through the company's own site and distributed via Splice.

The libraries are aimed at producers, engineers, and beatmakers looking for character-driven drum sounds outside of the standard polished pop palette, with reference points ranging from lo-fi and garage to disco and pop-punk. Producer Finneas has cited the use of Circles samples on Billie Eilish's track "Birds of a Feather."