NGC 3741 is an irregular galaxy in the constellation Ursa Major.

It has a disk of neutral hydrogen (H I) that is extremely wide, extending some 23,000 light-years (7 kpc).

[6] NGC 3741 has a central bar and a faint spiral arm rich in H I.

The bar rotates slowly, likely due to interaction with the dark matter.

[3] The unusual properties could be explained if NGC 3741 were a late-stage merger between a low-mass companion or if it accreted mass from the intergalactic medium.