The East of Scotland Universities Air Squadron (Scottish Gaelic: Sguadron Adhair Oilthighean Taobh an Ear na h-Alba), commonly known as ESUAS, is a squadron within the Royal Air Force established in 2003 as an amalgamation of "East Lowlands Universities Air Squadron" (ELUAS) and "Aberdeen, Dundee and St Andrews Universities Air Squadron" (ADStAUAS). It is based at Leuchars Station (Royal Air Force Leuchars until 31 March 15 when it was transferred to Army control), in Fife and flies a fleet of six Grob Tutor aircraft. ESUAS is the parent Squadron of 12 Air Experience Flight, who share the aircraft.

A squadron leader is the Commanding Officer and ESUAS has another four Qualified Flying Instructors, Chief Ground Instructor, and a Ground Training Instructor. There are some 90 students, 20 civilian support staff who are contracted from Babcock, plus an adjutant and two civilian admin staff.

Students apply to join ESUAS at their university's Freshers' Fair and then undergo a selection process. If successful they are attested and join the Royal Air Force Volunteer Reserve as an Officer Cadet symbolised by a white rank tab. Normally, students are recruited for a period of two years. Currently, ESUAS recruit from ten academic institutions in Eastern Scotland: Aberdeen, Abertay, Dundee, Edinburgh, Heriot-Watt, Napier, Perth, QMU, RGU, and St Andrews.

ESUAS' flying syllabus allows students to progress to achieve their PFB (Preliminary Flying Badge), along the way flying solo. Other activities include Sports, Adventurous Training, Charity, Engagement, Green's Training and a healthy social scene.

The aim of ESUAS, like other University Air Squadrons is to let young people experience life in the Royal Air Force, without commitment to regular service and to provide training in the fields mentioned. ESUAS also parents sponsored students, on cadetships or bursaries, who will go on to join the RAF.