The 29-year-old from Sheffield becomes the 16th man to top the list since the world rankings were first introduced in the mid-70s - and the first Englishman since Lee Beachill was world number one in December 2004, which followed fellow countryman Peter Nicol's 60-month run between 1998 and 2004.
Matthew clinched the sport's premier position after winning last month's Sky Open, the third PSA Super Series event of the year in Egypt. The triumph marked his fourth Tour title of the year - and moved the British National champion ahead of rival Ramy Ashour, the Egyptian who had topped the rankings since January. Favourite Ashour suffered a surprise semi-final
defeat in front of his home crowd in Cairo.
"Becoming world number one is every sports person's dream and it's something I've worked towards all of my squash life since I turned professional in 1998," said Matthew on hearing the confirmation of his achievement. "The enormity of it certainly hasn't sunk in yet (there's something about being a squash player that keeps your feet firmly on the ground!) and at the time it certainly came out of the blue, as I had prepared myself to have to beat Ramy in front
of all his fans in the final if I were to achieve my goal!
"Squash missing out on London 2012, and Rio 2016 for that matter, was a massive blow and hopefully this will give the sport of squash a much-needed boost in this country. England squash is currently enjoying its most successful period ever and hopefully, as a group, we can inspire the next generation of players.
"With the season being over now, it's a great time to have achieved this," Matthew added. "It means I can put my feet up for a few weeks and then come back refreshed and ready for the new challenge of holding on to the top spot. When I come back I will be reassessing my goals - and becoming World Champion and winning Commonwealth gold will be very high on the agenda."
Alex Gough, the former world No5 who is now the PSA CEO, added: "There is no one out there at the minute that deserves this more than Nick. Over the last three or four years he has had more setbacks than anyone - but he has never once complained.
"Instead, fearlessly and relentlessly, he has come back time after time with this as the main goal in mind. It will have meant everything for him to reach world number one and he will not want to let this feeling go. The other guys on the Tour are going to have to double efforts to get it back from him.
"Squash is in a fantastic place at the moment, as any one of five or six players can win one of the major events - and this is leading to very high quality matches and tournaments. The second half the year starts again in Canberra, Australia for the Australian Open in August - and all eyes will be on Nick Matthew to see how he handles the extra pressure."
June top 20 (inc. points average):
1 [2] Nick Matthew ENG 1,283
2 [1] Ramy Ashour EGY 1,190
3 [3] Amr Shabana EGY 968
4 [4] Karim Darwish EGY 858
5 [6] Gregory Gaultier FRA 700
6 [5] James Willstrop ENG 681
7 [8] Thierry Lincou FRA 549
8 [7] Peter Barker ENG 519
9 [9] Daryl Selby ENG 412
10 [10] David Palmer AUS 395
11 [12] Wael El Hindi EGY 380
12 [11] Laurens Jan Anjema NED 372
13 [13] Adrian Grant ENG 334
14 [14] Mohamed El Shorbagy EGY 333
15 [15] Alister Walker ENG 330
16 [16] Cameron Pilley AUS 326
17 [17] Stewart Boswell AUS 310
18 [18] Mohd Azlan Iskandar MAS 285
19 [19] Ong Beng Hee MAS 266
20 [20] Omar Mosaad EGY 255
Issued by Howard Harding on behalf of the PSA