From my research - with help from my Russian friend Denis Kirsanov:
Belgium (Flanders)
Series 1 Transmission: 5th January – 30th March 1971 (BRT)
Series 2 Transmission: 5th October 1971 – 11th January 1972 (BRT)
Canada
Title: Temporel (Temporal) in French Speaking Regions, otherwise Catweazle
Transmission: 5th September 1974 – 27th February 1975 (CBFT Montreal, CBOFT Ottawa and CBWFT Winnipeg)
The series also aired in Quebec.
Czechoslovakia
Title: Čáryfuk (Chuck)
Transmission: 1987 (ČST)
Hungary
Transmission: 1989 (Sat1)
Iceland
Title: Skreppur seiðkarl (Scratch Catcher)
Transmission: 6th January – 19th September 1971 (RÚV)
Malaysia
Transmission: 20th July – 23rd November 1975 (Channel 3)
Netherlands
Series 1 Title: De Tovenaar van Saburac (The Wizard of Saburac)
Series 2 Title: Catweazle – De tekens van de Dierenriem (The Signs of the Zodiac)
Series 1 Transmission: 4th January1970 – 29th March 1970, 7.05pm (Nederland 2)
Series 2 Transmission: 3rd October – 26th December 1971, 7.05pm (Nederland 2)
Norway
Title: Den merkelige mannen (The Strange Man)
Transmission: August 1970 – 1971 (NRK)
More detailed info here:
no.wikipedia.org/wiki/Den_merkelige_mannen Spain
Transmission: 1989 (Sat1)
Sweden
Series 1 Transmission: February – May 1971
Series 2 Transmission: January – April 1972
West Germany
Title of series: Catweazle
Transmission: 28th April – 29th September 1974 (ZDF)
Catweazle was also transmitted in Australia, Gibraltar, Ireland, New Zealand and Nicaragua.
Oh... and Britain!