Authorities say the suspect was armed with a knife when he held up a worker at the 99-Cent Pizza shop on Canal Street just after 10 p.m. Thursday.
The suspect tried to get into the register but ended up taking off with the tip jar.
The employee was not hurt.
Detectives are looking into whether the incident is linked to other pizzeria robberies in the area.
Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).
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