Students enrolled 537
School leader Carl Semmler
Type Religious

Contact this school

1225 Ostrander Avenue
Riverhead, NY 11901

(631) 727-5900
Nearby homes for sale
Map of Bishop Mcgann-Mercy Diocesan High School address.

4 stars
Based on 18 ratings

Let others know what you
think about this school

September 28, 2014
Unfortunately, this school should not call itself a catholic school. I've never in my life have seen educators want the students to fail as much as this staff!! Instead of working with their students to succeed they would rather fail them. As far as the administration, they pick and choose who they want to discipline. If it's an easy target they will step in but if it's a big donors child they do nothing. It's a shame how this school is considered a catholic school but there is nothing Christian about it!

- submitted by a parent
March 01, 2014
My son loves Mercy! Thank God for Catholic School. When he attended Pulaski he was almost killed by a student, Riverhead public schools, pure violence. My son has been at Mercy since 7th grade, he is now a 9th grader, and honor student. He has good friends there, they are not snobby, and we are not rich, not even close. My priorities are not fancy cars, clothes, and having my hair and nails done. My priority is an excellent education and safety for my son. After my son was in the dangerous Riverhead public school, the only option was Mercy or home school. I chose Mercy instead of home schooling for so many positive reasons for my son. He couldn't be happier. Way to go Mercy!!!

- submitted by a parent
November 23, 2013
I went to the school play here just this weekend and was absolutely DISGUSTED to hear foul language used in the play repeatedly, in addtion to using the Lord's name in vain and two male characters kiss on the stage. Unbelievable. I wonder how the priests in the audience and the school principal feel about it. Apparently there are no differences between this parochial school and the local high school.

- submitted by a community member
October 20, 2013
As a prior student I have to say these were some of the best four years of my life. I still have great friends and close relationships with the people I met here at mercy. The faculty truly believes in you and wants the best out of you. Yes they do push you and they don't except less than your full potential but that is one of the best qualities of this special place. Unlike other catholic schools on Long Island, mercy has the heart and character. In other words the morals and values you learn here are truly priceless. You cannot put a price tag on friendships, right from wrong, compassion, selflessness, and the meaning of the word family. This is all a result of being a part of the mercy family . I wouldn't trade it for the world

- submitted by a community member
January 09, 2011
I love Mercy and I think all the kids I know are really nice. I'm a new eighth grader and I'm shy. I was afraid everyone would be cliquey and have friends already and would ignore me, but everyone was kind and accepting. there were only a few annoying kids. Overall, it's great.

- submitted by a community member
August 20, 2010
The school is centered around family and values where all are respected. Parents have like kind values and education is a top priority. All the children are involved in activities there is something for everyone there. Go Monarchs

- submitted by a parent
no rating February 07, 2010
Best school ever! great teachers and faculty members. It's like my second family/home.

- submitted by a student
February 07, 2010
Best school ever! great teachers and faculty members. It's like my second family/home.

- submitted by a student
no rating October 13, 2009
I am a freshman at McGann Mercy and I agree with the girl in 7th grade, it is very cliquey and the kids there are very stuck up. Honestly i hate it there. Compared to my firends in public school the kids are pretty mean. The academics are okay but nothing great. I also hope to switch back to public school.

- submitted by a student
October 01, 2009
This review submitted without content.


- submitted by a parent
no rating June 30, 2009
I am a 7th grader here at McGann-Mercy. The acedemics are good, but the classes are really small and form cliques. The kids seem stuck up,coming from public school the kids weren't as spoiled. I grew tired over this school very quickly and now i'm hoping to go back to public school for my 8th grade year.

- submitted by a student
no rating December 20, 2008
I am a freshman and I love Mc Gann Mercy. The staff is wondeful and the principal is the nicest man! Phone calls to home wishing a merry christmas and other school related things are really a plus! The 'friendly neighborhood chaplain' Father Mike is a real character! In the best way! I just love everything about the school and I'm so glad my parents send me there! =]

- submitted by a student
no rating December 18, 2008
Bishop McGann has seen great strides in thier academics, Athletics, and Spiritual guidance. Dr. Steve Cheeseman has led this group of teachers, many of whom are retired from public school with years of experience behind them. Test scores speak for themselves! Safety, probably one of the best on the east end with its name badges, electronic gates and security guards on duty on a regular basis.

- submitted by a parent
November 23, 2008
This review submitted without content.


- submitted by a student
September 22, 2008
I am an alumni and send my children to Mercy. The Junior High program is excellent. The children are given every opportunity for advancement. My child has flourished. The High School has gone through many changes for the good. The principal & staff are first rate. Father Mike ties it all together. A+

- submitted by a parent
November 05, 2007
This review submitted without content.


- submitted by a parent
August 02, 2007
This review submitted without content.


- submitted by a student
October 02, 2006
In the last few years with the addition of diocesan support, this school has done an excellent job in adding academic courses and extracurricular activities (incl. sports, music and drama) while still retaining the special spiritual, caring community established by the Sisters of Mercy. This nurturing environment is what makes this school so special. Children are not just a number here. They are seen as a vital part of this scholastic community and are encouraged to live and learn to their fullest potential.

- submitted by a parent
May 12, 2006
the quality is overall excellent.

- submitted by a student
May 02, 2006
caring environment, fine arts programs are growing- good drama dept parent involvement welcome

- submitted by a parent
October 18, 2005
Very small high school that is improving every year. Great principal.

- submitted by a parent
September 09, 2003
Mercy has been everything we had expected from a high school. The teachers are friendly and students seem to be in a family like atmosphere.

- submitted by a parent
August 26, 2003
This review submitted without content.


- submitted by a former student
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Bishop Mcgann-Mercy Diocesan High School
1225 Ostrander Avenue, Riverhead, NY  11901
(631) 727-5900
Last modified Bishop Mcgann-Mercy Diocesan High School is a Private school that serves grades 7-12
Bishop Mcgann-Mercy Diocesan High School Rating: 4 out of 5 based on 23 reviews. Top