o	or
obispado	bishopric
obispo	bishop
óbito	death
obligación	obligation
obrero	worker, laborer
observaciones	comments, marginal notes
occidente	west
octavo (a)	eighth
octubre	October
ochenta	eighty
ocho	eight
ochocientos	eight hundred
oeste	west
oferta	offering
oficio	office
ojo	eye
óleo	oil
once	eleven
onomástico (a)	onomastic (referring to names)
operario	worker, laborer
oración	prayer
oreja	ear
orfanato	orphanage
oriente	east
original de	native of
oro	gold
o.s.p. = obiit sine prole	died without issue
otońo	autumn
otro (a)	other, another