Abstract: We collected almost all of the type II quasars 
so far discovered. 
Among them 485 sources have photometric data at JHK 
bands, mainly from 
2MASS observations, 65 sources have IRAS photometric 
data in at least one of 
the three IRAS bands at 25, 60 and 100μm, and 15 
sources have IRAS 
photometric data in all three IRAS bands. We find that in 
nearly half of all type II 
quasars, both the near and far infrared radiation is 
dominated by starlight or 
thermal reprocessing of starlight by dust in the 
underlying galaxy. The infrared 
radiation of the other group (slightly over half) is 
dominated by non-thermal 
radiation in the near infrared, and mostly in the far 
infrared also (although there 
is a mixture particularly for the longer wavelengths). It 
is proposed that for the 
later group, hidden broad lines may exist in the infrared. 
On the basis of our 
and previous results, we also discuss the possibility 
that there are two distinct 
classes of type II quasars: "true" type II quasars 
without a BLR, and heavily 
obscured type I quasars, in full analogy with the case 
for type II Seyferts. No 
relationships can be found for either the near infrared 
or the far infrared colors 
and the redshift. Correlations between absolute 
magnitude in the near and far 
infrared with redshift are found, but could be due to a 
flux limit (Malmquist bias).