B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Other / Unknown
Conflict Ground Conflict; Critical; Ground Event / Encounter Vehicle
Flight Crew Took Evasive Action
Human Factors
The Lead Ramp Guide was marshalling us into the gate.  While I was concentrating on his directions bringing us into the gate I caught; out of my left peripheral vision; what turned out to be a catering truck crossing directly from left to right in front of the aircraft.  I applied hard brake pressure and the aircraft came to a stop.  The truck drove on by.
B737 Captain reports a near collision with a catering truck that cuts in front of the aircraft while he is being marshalled into the gate.