The 1950 National League Division Three was the fourth season of British speedway's National League Division Three The league was reduced from 13 teams to 10. Halifax Dukes, Plymouth, Yarmouth and Hanley had all moved up to Division Two whilst Hastings Saxons dropped out. The two new sides were Aldershot Shots and St Austell Gulls whilst Tamworth changed their nickname from 'Hounds' to 'Tammies'. Ken Middleditch of Poole topped the averages.