My blood group is a+ & my boy friend is o+ can we marry?

Absolutely: No problem with the two of you making wonderful children together. All will be either A or O blood type. rH factor a bit more difficult to predict as + is a dominant factor and don't know if you are hybrids for that trait. Likelihood is they will be rH positive since it is dominant. Then if there is love and commitment, you can marry!

I don't see not: There is no reason to worry about blood group, marry away :) good luck.

Yes: It is perfectly safe and acceptable for a person of one blood type to marry another with the same or a different blood type.

Yes: A man and a woman of any blood type (A,B,O) and Rh factor combination can marry. If you were Rh negative and the father was Rh positive, you would have to receive Rhogam if your baby is Rh +, but the mother is Rh -.

Yes: No blood types keep you from marrying, they just limit who you can receive blood from or donate blood to. Congratulations on your upcoming nuptials!!

Yes, of course: Blood groups do not matter for getting married. The only risk is having a pregnancy if you were to be Rh- negative(which are not).

Yes : Yes , the difference in blood group should not be a problem , and especially that Both of you are Rh positive .

Yes: If you are concerned your different blood types would adversely affect your fertility or a future developing fetus, no need to worry. If by "can we marry?" you mean something more than that, I am not qualified to answer!