Simon Philbert (born 22 October 1974), known professionally as Si Phili, is a British rapper.

He was a member of the former UK hip hop group Phi Life Cypher, which split in 2012.

The trio started making music together around 1996, and have since had much success on the UK underground circuit.

Phi-Life Cypher made it to the final of Tim Westwood's Talent 2000 competition and ripping the mic on DJ Skitz's seminal posse cut 'Fingerprints of the Gods' projected them to the upper realms of the UK hip hop scene.

The new year also saw a complicated performance at the 2002 Brit Awards, featuring the band in 3D animation, weaving in and out of each other on four large screens along with rap accompaniment by Phi Life Cypher.