Psicólogo colegiado CVXXX

00:15 Feb 24, 2018 

In this case, Chartered psychologist, as chartered member of the British Psychological Society (BPS), would be a fair translation of Psicólogo Colegiado -even though the latter refers to a regional (not national) society; Colegio Oficial de Psicólogos de [región correspondiente].
Registered psychologist -registered in the HCPC (Health and Care Professions Council)- refers to an independent but complimentary registration to that of the BPS. It has no equivalence in Spanish but as Psicólogo Colegiado -although it is not an exact equivalent either.
I guess chartered could be considered to be closer to the original, but from a practical stand point I would use the more common registered psychologist, as patinba has already suggested.

18:20 Feb 23, 2018 

There is in fact a difference between registered and chartered psychologists; whether either of these terms is an accurate translation, rather than the literal "collegiate" which I've suggested, is moot.

13:13 Feb 23, 2018 

Depending on the intended audience, I think you are probably right about "Chartered Psychologist". This is what is used in the UK anyway. https://www.bps.org.uk/public/find-psychologist