ペティション系（ペティションけい、）は、馬（主にサラブレッド）の父系（父方の系図）のひとつ。

 サイアーライン 

Darley Arabian 1700
Bartlet's Childers 1716
Squirt 1732
Marske 1750
Eclipse 1764　　　---←エクリプス系へ戻る
Potoooooooo 1773
Waxy 1790
Whalebone 1807
Sir Hercules 1826
Birdcatcher 1833
The Baron 1842
Stockwell 1849
Doncaster 1870
Bend Or 1877
Bona Vista 1889
Cyllene 1895
Polymelus 1902
Phalaris 1913　　　---←ファラリス系へ戻る
Fairway 1925　　　---←フェアウェイ系へ戻る
Fair Trial 1932　　　---←フェアトライアル系へ戻る
Petition 1944　　　---↓ペティション系（改行）

---↓ペティション系---

Petition 1944
March Past 1950
Don't Look 1957
Bury Hill 1958
Queen's Hussar 1960　→Highclere 1971
Seventh Hussar 1966
Rego Hussar 1972
Always Welcome 1973
Regimental Honour 1975
Top Hussar 1978
Shiny Tenth 1967
Brigadier Gerard 1968
Etienne Gerard 1974
Mont Thabor 1978
General 1974
Stonewall 1980
Lord at War 1980 →John's Call 1991
Lord Hailey 1987
Lord Excel 1997
Lord Amigo 2006
Must be War 1989
Must Be Fair 2003
Storm's Close 2015
Patton 1991
Bohamian Butler 1999
Lord of Warriors 1995
Lasting Legacy 1997
Mighty 1997
Act of War 1998
Lasting Tribute 1998
Honor in War 1999
Imperial Guard 1974
Admirals Launch 1975
Lord Byron 1981
Kayak 1996
Cuentas Claras 1983
Cuentas Largas 1993
El Morocho 2004
Enojado 1983
Zidane 2000
Mount Royal 1989
Imparcial 2002
Car Mount 2007
Brigade of Guards 1975
Taxiarchos 1975
Palace Dancer 1976
R B Chesne 1976
Apeldoorn 1982
Perim 1993
Sweet Chesne 1985
Karashaan 1977
Light Cavarly 1977
Vilas Light 1989
Brillant Light 1998
Junta 1978
Vayrann 1978
Geral 1979
White Spade 1980
Silverbulletknight 1999
Roman Raider 1981
Comrade In Arms 1982
Celtic Arms 1991
Malone 1998
River Cafe 1982
King Top 1969
Fife and Drum 1974
Private Line 1975
Federico 1983
El Motivo 2001
Bozovici 1977
Church Parade 1978
Retained 1967
Camouflage 1968
Dawn Review 1969
Roy Bridge 1969
Sousa 1973
King's Composer 1992
Propitiation 1950
Coronation Year 1951
Le Dieu d'Or 1952
Goldhill 1961
Golden Mallard 1968
Gold Form 1969
High Award 1971
Hopeful Affair 1972
Goldhills Pride 1974
Pit Boss 1953
Coasting 1955
Day Court 1955
Sum Up 1962
Court Road 1966
Tarasco 1976
Girospe 1985
Pandour 1955
Baryulah 1974
Bochum 1977
Sir Witten 1986
Ironic 1957
Negotiation 1957
Zouave 1958
Hodell 1959
Experte 1969
Nandino 1980
Mandamus 1960
Mr. Bigmore 1972
Mandalus 1974
Tullibards Beetman 1990
Runnymede 1961
The Go Between 1970
Vorvados 1977
Akvarium 1989
Charter Day 1971
 *ホワイトファイア 1962
Coup de Feu 1969
Clever Coup 1978
My Swanee 1963
French Swanee 1973
 *ペトロス 1964
Pettyless 1965
Petingo 1965
Ifni 1970
Nelite 1979
 *サティンゴ 1970
レオティンゴ 1982
Pirgos 1970
Pitskelly 1970
Tood 1985
Bellissimo 1971
Bellingo 1986
 *イングリッシュプリンス 1971 →Sun Princess 1980
Prince Ragusa　1981
 *ピットカーン 1971
Ela-Mana-Mou 1976
Sumayr 1982
Almaarad 1983
Natski 1984
Natski's Native 1991
Shahdji 1984
Emmson 1985
Groove 1992
Heavenly Manna 1985
Snurge 1987
Rhodesian Winner 1999
Double Trigger 1991
Double Eclipse 1992
O'Connor 1992
Lucky Look 1976
カネクロシオ 1980
シーハリアースタン 1980
ピットヒヤク 1991
Tingo 1971
Titer 1987
Three Legs 1972　→Horlicks 1983
Jolly Jake 1981
Random Chance 1982
Random Choice 1990
Shannon 1983
Glenbrook 1991
Patris 1973
Perplejo 1982
Diligo 1974
Egmont 1974
Petronisi 1974
Jimmy Who 1975
Wastin 1984
 *ソルティンゴ 1975
イブキラーゼン 1981
スズパレード 1981
 *ヴァリィフォージュ 1975
チュニカオー 1985
Casino Royale 1975
Forties Field 1975
Major Petingo 1975
 *パーシィコ 1976
 *サンディクリーク 1976
Hill's Forecast 1976
 Troy 1976　→Helen Street 1982
Ilium 1981
B. G. Aquisition 1988
Trojan Fen 1981
Northern Trojan 1987
Tropular 1981
Ragmar 1993
Trojan Fort 1983
War Hero 1983
 *ダイナゴー 1977
Joberan 1977
John Florestan 1966
Joselo 1973
Renovador 1979
Lance 1987

 サイアーライン上は種牡馬もしくは種牡馬入りを表明した馬。