伪体染色体区（英语：pseudoautosomal region），又称伪体染色体区，是在高等动物性染色体（即X染色体和Y染色体）上的一段同源串行，分为PAR1和PAR2两部分，目前共已发现29个基因。

伪体染色体区是X染色体和Y染色体间唯一可发生互换的位置，这也是它的名称由来，由于会发生互换的是体染色体，X染色体和Y染色体一般是没有互换的现象，只有在伪体染色体区反常地出现了互换，导致男性和女性都带有两个该区域基因的复本。这使伪体染色体区的基因表现类似体染色体，而非性染色体的性联遗传模式，因而得名。

The pseudoautosomal regions, PAR1, PAR2, and PAR3, are homologous sequences of nucleotides on the X and Y chromosomes. Although genetic recombination (occurring during sexual reproduction) is known to be limited only to the pseudoautosomal regions (PAR1 and PAR2) of the X and Y chromosomes, a 2013 study reports allelic unequal recombination between the X-chromosome-transposed region (XTR) Yp11.2 and Xq21.3, indicating the presence of a new PAR, which has been named PAR3. This PAR3 region is exhibited in 2% of the general population. Also, the additional layer of justification has been provided from another study on six dyslexic cases which were shown to harbor duplications and deletions in the same Xq21.3 and Yp11.2 regions through allelic unequal recombination.