Am 20.11.2015 um 18:22 schrieb Legoktm:
Kind of.
https://en.wikipedia.org/w/api.php?action=query&titles=Douglas%20Adams&prop=pageprops&formatversion=2 maps a page title on the English Wikipedia to its Wikidata Q id.
You can also look this up directly on wikidata: https://www.wikidata.org/w/api.php?action=wbgetentities&sites=enwiki&titles=Douglas_Adams&props=
https://www.wikidata.org/w/api.php?action=wbgetentities&ids=Q42&props=sitelinks will do the reverse.
A bit more terse, and with full URLs in the output: https://www.wikidata.org/w/api.php?action=wbgetentities&ids=Q42&props=sitelinks|sitelinks/urls&sitefilter=enwiki
You can also let yourself be redirected directly: https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/Q42
Or the the reverse redirect: https://www.wikidata.org/wiki/Special:ItemByTitle/enwiki/Douglas_Adams
HTH