T44 is a Swedish diesel-electric locomotive built by Nydqvist & Holm (NOHAB) and Kalmar Verkstad (KVAB) in 123 units between 1968 and 1987.

It is the most common diesel locomotive in Sweden, with state-owned Green Cargo as the largest operator.

Other operators include Israel Railways (one), Malmtrafik (two) and formerly Norwegian State Railways (one, designated NSB Di 7) and Inlandsbanan AB.

Compared to the predecessor T43 class, the T44 is more powerful and has a modernized drivers cab, with better noise insulation, though there are many similarities between the models.

In 2007, Green Cargo has ordered a full renovation of 100 units from Bombardier Transportation which included new four-stroke engines from MTU (type 12V 4000 R43).