DDO 44 (or UGCA 133) is a dwarf spheroidal galaxy in the M81 Group, believed to be a satellite galaxy of the nearby NGC 2403.

DDO 44 is a relatively large dwarf galaxy, and it has been observed to possess a tidal tail extending at least 50,000 parsecs from its center.

[6] Stellar streams has been observed to originate from DDO 44, flowing towards and away for NGC 2403, indicating tidal disruptions.

[7] Around 20 percent of the galaxy's stars are believed to be of intermediate age (between 2-8 Gya),[5] with the most recent stellar formation being estimated at 300 Mya due to a lack of young bright blue stars.

[12] HI observations place an upper limit for DDO 44's hydrogen gas mass at 4×105 M☉.