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Supernova Remnants and Pulsar Wind Nebulae are among the most significantsources of non-thermal X-rays in the sky, and the closest laboratories whererelativistic plasma dynamics and particle acceleration can be investigated.Being strong synchrotron emitters, they are ideal candidates for X-raypolarimetry, and indeed the Crab nebula is up to present the only object whereX-ray polarization has been detected with a high level of significance. Futurepolarimetric measures will likely provide us crucial informations on the levelof turbulence that is expected at the particle acceleration sites, togetherwith the spacial and temporal coherence of the magnetic field geometry,enabling us to set stronger constraints on our acceleration models. In PWNe itwill also allow us to estimate the level of internal dissipation. I willbriefly review the current knowledge on the polarization signatures in SNR/PWNeand I will illustrate what can we hope to achieve with future missions likeIXPE/XIPE.

Future X-ray Polarimetry of Relativistic Accelerators: PWNe and SNRs