With the Lick Observatory 3m telescope and image dissector scanner we have obtained new spectrophotometric observations of three halo planetary nebulae; 49 + 88°1, 108 − 76°1, and K 648. Based on the observed line intensities we are able to compute temperatures, densities, and abundances of He, 0, N, and Ne. Our data show that the helium abundance in the halo planetaries is normal with respect to disk planetaries. Oxygen is consistently less abundant in the halo planetaries by factors of 4, 12, and 20. The ratio N/0 in 49 + 88°1 and K 648 is typical of disk planetaries while N/0 in 108 − 76°1 is an order of magnitude larger. This suggests to us the possibility that varying amounts of mixing of CNO processed material has taken place in the progenitor stars. We do not detect [S II] or [S III] emission in K 648 or 108 − 76°1. In 49 + 88°1 [S II] and [S III] are present but weak and we derive an S abundance which is roughly a factor of 10 smaller than for disk planetaries. K 648 has the lowest abundances of 0, N, and Ne of all these halo planetary nebulae.