Awards and nominations:
Maroulis was the recipient of the Hellenic Times Scholarship Fund's Humanitarian Award for Artistic Achievement in 2007. These annual awards recognizing outstanding achievement in the Greek-American community are presented to "individuals who have proven that hard work and dedication lead to achievement, thereby setting a perfect example for the HTSF scholarship recipients to emulate." That same year, he was also honored with an award from New York City Comptroller William C. Thompson, Jr. at the sixth annual Greek Heritage and Culture Celebration; honoring individuals recognized as leaders in the Greek Community.
For his performance in the role of Drew in Rock of Ages, Maroulis received a nomination for the Tony Award for Best Performance by a Leading Actor in a Musical; one of five total Tony nominations received by Rock of Ages. For this role he also received a Drama League Award Nomination for a Distinguished Performance Award.
Inside Broadway, the not-for-profit educational organization noted for its efforts in introducing musical theater to young audiences in the New York City area, presented Constantine with a Broadway Beacon Award on June 25, 2009. These awards are given to individuals in recognition of their support of theater and arts education for the inspiration of young people.
On July 1, 2009, after a matinee performance of Rock of Ages, Maroulis and the rest of the cast set a new Guinness World Record for the Largest Air Guitar Ensemble. A total of 810 participants, including audience members and fans, shattered the previous record of 440 people playing air guitar simultaneously.
Maroulis was selected as Broadway.com's "Broadway Star of the Year" for 2009, after receiving over 25,000 votes from Broadway fans and readers of the site.
In March 2010, Maroulis received the honor of being immortalized in a caricature at Sardi's, taking his place alongside other Broadway luminaries similarly honored at the legendary New York City establishment. A month later, the Rock of Ages star was immortalized in a second portrait; this time joining the ranks of the famous on the Broadway Wall of Fame at Tony's di Napoli, also in New York City. On April 26, 2010, Maroulis was honored by the New York City Council for his achievements, at a Council event celebrating the 189th year of Greek Independence.
Maroulis was selected by the Greek America Foundation as one of their "Forty Under 40" winners for 2010. This award recognizes the accomplishments of notable young Greek Americans, who stand out as leaders and who are dedicated to the Greek community.
In June 2011, Maroulis was the recipient of a Gabby Award presented by the Greek America Foundation, in the category of Performing Arts. The Gabby Awards are awarded in recognition of outstanding achievement by those considered as amongst "the best and the brightest" in the Greek community.
Maroulis received the 2011 Spotlight Award from the Elios Society, which honors the achievement of Greek-Americans in the arts and entertainment field.
In 2013, Maroulis received a Drama League Award Nomination for a Distinguished Performance Award for his performance in the title role of Jekyll and Hyde.
Maroulis was the first-ever recipient of the Loukoumi "Make a Difference" Award, in January 2015. The award recognized his contributions to the entertainment world and in particular acknowledged his ongoing efforts to support and inspire children.