The microwave spectrum of indole has been observed using a conventional Stark-modulated microwave spectrometer in conjunction with a heated absorption cell. Spectral transitions were also observed in a pulsed molecular beam Fabry-Perot microwave spectrometer using a heated nozzle source. The high resolution (20 kHz) available with the Fabry-Perot instrument allows the observation of the 14N nuclear electric quadrupole hyperfine splittings. An analysis of the 44 measured transitions gives the following rotational constants: A = 3877.8366(64) MHz; B = 1636.0461(48) MHz; and C = 1150.0900(19) MHz. The 14N quadrupole coupling constants that were determined from the hyperfine analysis are eQqaa = 1.7263(43) MHz; eQqbb = 1.6525(50) MHz; and eQqcc = -3.3788(48) MHz. The observed rotational constants are compared with those obtained from a recent optical study of indole and the 14N quadrupole coupling constants are compared with those of pyrrole.