Masters M50 400 metres world record progression

This is the progression of world record improvements of the 400 metres M50 division of Masters athletics.

;Key:

{{legend2|#f6F5CE|Incomplete information|border=solid 1px #AAAAAA}}

class="wikitable"
Hand !Auto !Athlete !Nationality !Birthdate !Location !Date !Ref
style="background:#cef6f5;" \| \|49.98 \|Ricardo Roach Gonzalez \|{{flagu\|Chile}} \|12 October 1972 \|Santiago \|19 October 2024 \|{{cn\|date=October 2024}}
\|50.51 \|Juan Lopez \|{{flagu\|Spain}} \|14 May 1970 \|Granada \|16 July 2021
\|50.73 \|Roland Gröger \|{{flagu\|Germany}} \|7 August 1964 \|Berlin \|25 June 2017
\|51.39 \|Fred Sowerby \|{{flagu\|United States}} \|11 December 1948 \|Orlando \|27 August 1999
\|51.60 \|Guido Müller \|{{flagu\|Germany}} \|22 December 1938 \|Hösbach \|3 June 1989
\|51.81 \|Reginald Austin \|{{flagu\|Australia}} \|16 October 1936 \|Melbourne \|4 December 1987
51.8 \| \|Ron Taylor \|{{flagu\|Great Britain}} \|4 December 1933 \|Swansea \|22 September 1986
\|52.24 \|Ingo Vierk \|{{flagu\|Germany}} \|1935 \|Rome \|29 June 1985
\|52.28 \|Francis Peter Higgins \|{{flagu\|Great Britain}} \|16 November 1928 \|Hannover \|1 August 1979
52.9 \| \|Jack Greenwood \|{{flagu\|United States}} \|5 February 1926 \|Gothenburg \|8 August 1977

class="wikitable"

Hand

!Auto

!Athlete

!Nationality

!Birthdate

!Location

!Date

!Ref

style="background:#cef6f5;"

|49.98

|Ricardo Roach Gonzalez