We demonstrate, to the best of our knowledge, the first spatiotemporally mode-locked dispersion-managed fiber laser. The fiber oscillator, which includes a 250 modes multimode fiber section, generates 20 nJ pulses centered at 1034 nm with 730 mW average power, 3.88 ps pulse duration and a Gaussian beam near single mode output profile. The output pulses are compressed to similar to 97 fs via an external grating compressor. (C) 2020 The Author(s)