1 January 1951 08:00 - Oak Grove, Louisiana, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object was observed by 15 witnesses for over 15 minutes (Sowell).

16 January 1951 11:00 - Artesia Apt, New Mexico, USA -   Instrumented observation. UFOs seen twice near Skyhook balloon, 1) at 0930 following launch, 2) at 1100 from Artesia Airport for 40 seconds.

8 February 1951 Morning - Atlantic -   USN R5D incident.

10 February 1951 00:55 - Vr1, Atlantic -   An object was observed. It buzzed a witness. One object, about 300 feet across, was observed by five military witnesses on the ocean for over seven minutes (Benton; Kingdon). Explanation: EM.

In May 1951 Night - Sydney, Fairfield, New South Wales, Australia -   Objects were sighted that had an appearance and performance beyond the capability of known earthly aircraft. Two objects were observed by one male 32-year-old witness (Jarrold).

22 May 1951 03:20 - Dodge City Sw100M, Kansas, USA -   Bluish-white object circled around plane.

In June 1951 Around 2200 - Whittier, California , USA -   Instrumented observation, sketch

20 June 1951 16:30 - Whittier, California , USA -   A hovering flying disc was observed. One disc, about 300 feet across, was observed in clear weather by one male witness in a city for over three minutes (Nemecek).

24 June 1951 03:30 - Richmond, Henrico Tpke, Virginia , USA -   Cat-and-mouse game of tag. Dirigible-shaped UFO with alternating white and yellow lights around circumference. High speed vertical climb.

In Mid- 1951 - Lermarken, Sweden -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. An unidentified object at close range, about 150 feet across, was observed by more than one witness (Nilsson).

In July 1951 Daytime - Augusta, Georgia, USA -   Kinman F-51 incident.

In Mid- 1951 Dusk - Downey, California , USA -   Cigar-shaped objects were observed. More than seven cigar-shaped objects were observed by four witnesses in a city for 20 minutes (Kline).

In Mid- 1951 21:00 - Mountain Home AFB, Idaho, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. An object was observed at close range by a male witness at an airfield (Broede).

Mid- 1951 Morning - Ballintuim Village, UK -   An object was observed from a car. One object, about 20 feet across, was observed by three witnesses for over one minute.

9 July 1951 - Madagascar -   Objects were sighted that had an appearance and performance beyond the capability of known earthly aircraft. An unidentifiable object was observed at close range (Cabrol). Explanation: Hoax.

In mid-July 1951 Around 2100 - San Antonio N36M, Texas, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object was observed by one witness for two minutes (Wilson).

15 July 1951 23:45 - Farmville, Virginia , USA -   Objects were sighted that had an appearance and performance beyond the capability of known earthly aircraft. Two objects were observed by one witness for 30 minutes (Chadwick).

In August 1951 19:30 - Rockford Bay, -   An object was observed from a car. One object was observed by five witnesses (Brown).

In August 1951 Night - Norfolk, Virginia , USA -   Orange disc with flattened edge.

15 August 1951 09:00 - Hurdsfield, North Dakota, USA -   An unidentified object was sighted, that had an unusual appearance or performance. One object was observed by several female witnesses (Newsom).

31 August 1951 12:45 - Matador, Texas, USA -   Pear-shaped object the length of a B-29 fuselage (100 ft).

In September 1951 18:00 - Memphis, Tennessee, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. An unidentified object at close range was observed by over 30 witnesses.

In Fall 1951 - Lermarken, Sweden -   An object was observed. Animal reactions to the object were reported. An unidentified object at close range was observed by more than one witness (Nilsson).

2 October 1951 11:00 - Massena, New York, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object was observed by one male witness for a few seconds (Lafrance; Laughing; Phillips, P).

3 October 1951 Daytime - St Lawrence River, New York, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object was observed by two witnesses for a few seconds (Sunday).

9 October 1951 13:45 - Paris, Illinois, USA -   Silvery object looked like flattened orange, motionless in sky,

15 October 1951 20:00 - Jacksonville, Florida, USA -   Sisters observe dark disc in sky over city park; sight landed saucer opening as they hide.

26 October 1951 04:00 - South Australia, Australia -   UFO illuminates tracks and train on main railroad line, nearly lands, speeds off.

In November 1951 Evening - Los Angeles, California , USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object was observed by one witness for over three minutes (Hower; Ohlendorf). Explanation: Psych.

2 November 1951 07:15 - Abilene E, Texas, USA -   AAL DC-4 incident. Explanation: Meteor.

In 1952 - Kobenhavn V, Denmark -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. An unidentified object at close range was observed by two witnesses.

In 1952 - New Zealand -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object, about 150 feet across, was observed on the ocean (Cathie).

In 1952 - Cassadaga, Florida, USA -   An object was sighted that had an appearance and aerobatic performance beyond the capability of known earthly aircraft. One object was observed on a highway.

In 1952 - Akron, Ohio, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. An unidentifiable object was observed at close range (Perretta).

December 1952 03:00 - Peru, Nebraska, USA -   Cauldron-shaped object on the ground. Explanation: Psych.

In 1952 06:30 - Alameda, California , USA -   A cigar-shaped object was observed. One cigar-shaped object was observed by two male witnesses for a few seconds (Musel).

In 1952 Daytime - Denmark, Wisconsin, USA -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One object, about 150 feet across, was observed by two witnesses.

In 1952 Afternoon - Dumfries, UK -   An object was sighted that had an appearance and performance beyond the capability of known earthly aircraft. One disc was observed by one experienced male witness for five minutes.

In January 1952 - Alor Setar, Malaysia -   Objects were sighted that had an appearance and performance beyond the capability of known earthly aircraft. Three objects were observed.

In January 1952 22:30 - Weston, Wyoming, USA -   Rancher incident.