Yes, it can.
 
There is an example in the configuration file.

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> Date: Thu, 15 Nov 2007 13:33:56 +0200
> From: bazy@goofy.celuloza.ro
> To: users@lists.roundcube.net
> Subject: [RCU] ldap address book
>
> Hello people,
>
> I looked over the roundcube website for ldap address book support but
> didn't find anything...
>
> Can roundcube mail search a ldap address book?
>
>
>
>
> Thank you,
>
> _______________________________________________
> List info: http://lists.roundcube.net/users/

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