The thermal decomposition of pyrrolidine was studied behind reflected shocks in a single-pulse shock tube over the temperature range 900-1400 K and overall densities of ~3 X 10~1 2345 mol/cm3. Under these conditions the following reaction products were found in the postshock mixtures: H2, CH4, C2H4, C2H6, C2H2, C3H6, CH2==C=CH2, CH3C=CH, CH2=CHCH2CH3, HCN, CH3CN, CH2=CHCN, C2H5CN, and small quantities of pyrrole and butadiene. Studies with a mixture of pyrrolidine and pyrrolidine-i/g show that C2H4 and C3H6 are produced by direct ring cleavage with the following rate parameters: pyrrolidine -C2H4 + (CH2)2-NH, k = 3.42 X 1016 exp(-75.2 X 103/ ) s"1 and pyrrolidine -C3H6 + CH2=NH, k = 1.35 X 1016 exp(-80.4 X 103/RT) s"1, where R is expressed in units of cal/(K mol). Hydrogen cyanide has the highest concentration among the nitrogen-containing products, followed by acetonitrile. No reaction products resulting from pyrrolidine isomerization were observed.