A group of New Jersey residents had challenged the 45- year-old Texas senator's eligibility for the presidency. He was born in Canada to a Cuban father and American mother.
But Judge Jeff Masin found that Cruz met the constitutional requirements.
New Jersey's Lt Governor, Kim Guadagno, is now expected to review the decision.
Sen Cruz's main rival for the Republican nomination, Donald Trump, has also questioned his eligibility for the presidency.
The South Jersey Concerned Citizens Committee and law professor Victor Williams, a presidential write-in candidate, argued in court in on Monday that Sen Cruz's birth in Canada meant he could not be a "natural-born citizen" as envisaged by those who wrote the US constitution.
They claimed he was a naturalised citizen and that presidents had to be born on US soil.
Cruz's lawyer argued that he was a natural-born citizen because his mother was American.
On Tuesday Judge Masin dismissed the challenge, while acknowledging that "absolute certainty as to this issue is only available to those who actually sat in Philadelphia and themselves thought on the issue".
Judge Masin added that his decision might be adopted, modified or rejected by Lt Gov Guadagno, New Jersey's secretary of state, who is authorised to make a final decision on the matter. She must transmit the names of candidates to appear on the primary ballot to county clerks by Thursday.
A similar legal challenge was rejected a court in Pennsylvania, where Sen Cruz will appear on the state's Republican primary ballot later this month.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
