A Symbian port of Perl (for Nokia Series 60 phones) has been posted to the perl5-porters mailing list by Jarkko Hietaniemi. The author states that it may also run on other Symbian UI's. The ported versions are 5.8.x and 5.9.x. Further details on the mailing list archive.
Perl Port for Symbian Series 60
To save some people some time (maybe), here's the followup message on the mailing list with the link to the Sourceforge page where you can download a .ZIP file with .SIS files for Series 60.