HISD said the buses were parked at the Northwest Motor Pool on Pinemont over the Thanksgiving holiday when the parts were stolen.
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No arrests have been made, the district said.
HISD said 14 routes were impacted and substitute vehicles are currently taking kids to and from school.
A new ordinance to crack down on catalytic converter thefts and resale went into effect across Houston over the summer.
It requires individuals to show proof of owning a cut catalytic converter when they go to sell it to a metal recycler.
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Catalytic converter ordinance in effect after rise of thefts in Houston
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