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Over the past few decades impressive progress has been made in the field ofphoton polarimetry, especially in the hard X-ray and soft gamma-ray energyregime. Measurements of the linear degree of polarization for some of the mostenergetic astrophysical sources, such as Gamma Ray Bursts (GRBs) or Blazars, isnow possible, at energies below the pair creation threshold. As such, a newwindow has been opened into understanding exact nature of the non-thermalemission mechanisms responsible for some of the most energetic phenomena in theUniverse. There are still many open questions, and active debates, such as thediscrimination between leptonic vs. hadronic models of emission for Blazars orordered vs random field models for GRBs. Since the competing models predictdifferent levels of linear photon polarization at energies above 1 MeV,gamma-ray polarimetry in that energy band could provide additional crucialinsights. However, no polarimeter for gamma-rays with energies above 1MeV hasbeen flown into space, as the sensitivity is severely limited by a quickdegradation of the angular resolution and by multiple Coulomb scatterings inthe detector. Over the past few years a series of proposals and demonstratorinstruments that aim to overcome those inherent difficulties have been putforth, and the prospects look promising.

Gamma Ray polarimetry; a new window for the non-thermal Universe